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Mukherjee S, Saha S, Ghosh S, Adhikari S, Sathyamurthy N, Baer M. Quasi-Classical Trajectory Calculations on a Two-State Potential Energy Surface Including Nonadiabatic Coupling Terms as Friction for D + + H 2 Collisions. J Phys Chem A 2024; 128:7691-7702. [PMID: 39172694 DOI: 10.1021/acs.jpca.4c03237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/24/2024]
Abstract
Akin to the traditional quasi-classical trajectory method for investigating the dynamics on a single adiabatic potential energy surface for an elementary chemical reaction, we carry out the dynamics on a 2-state ab initio potential energy surface including nonadiabatic coupling terms as friction terms for D+ + H2 collisions. It is shown that the resulting dynamics correctly accounts for nonreactive charge transfer, reactive non-charge transfer and reactive charge transfer processes. In addition, it leads to the formation of triatomic DH2+ species as well.
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Affiliation(s)
- Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
- Department of Chemistry, Maulana Azad National Institute of Technology, Bhopal 462003, India
| | - Swagato Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Sandip Ghosh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, Nadia 741246, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Kolkata 700032, India
| | - Narayanasami Sathyamurthy
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, SAS Nagar, Manauli 140306, India
| | - Michael Baer
- The Fritz Haber Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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2
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Naskar K, Mukherjee S, Ghosh S, Adhikari S. Coupled 3D ( J ≥ 0) Time-Dependent Wave Packet Calculation for the F + H 2 Reaction on Accurate Ab Initio Multi-State Diabatic Potential Energy Surfaces. J Phys Chem A 2024; 128:1438-1456. [PMID: 38359800 DOI: 10.1021/acs.jpca.3c05590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
We had calculated adiabatic potential energy surfaces (PESs), nonadiabatic, and spin-orbit (SO) coupling terms among the lowest three electronic states (12A', 22A', and 12A″) of the F + H2 system using the multireference configuration interaction (MRCI) level of theory, and the adiabatic-to-diabatic transformation equations were solved to formulate the diabatic Hamiltonian matrix [J. Chem. Phys. 2020, 153, 174301] for the entire region of the nuclear configuration space. The accuracy of such diabatic PESs is explored by performing scattering calculations to evaluate integral cross sections (ICSs) and rate constants. The nonadiabatic and SO effects are studied by utilizing coupled 3D time-dependent wave packet formalism with zero and nonzero total angular momentum on multiple adiabatic/diabatic surfaces calculation. We depict the convergence profiles of reaction probabilities for the reactive as well as nonreactive processes on various electronic states at different collision energies with respect to total angular momentum including all helicity quantum numbers. Finally, total ICSs are calculated as functions of collision energies for the initial rovibrational state (v = 0, j = 0) of the H2 molecule along with the temperature-dependent rate coefficient, where those quantities are compared with previous theoretical and experimental results.
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Affiliation(s)
- Koushik Naskar
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Sandip Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata 741246, West Bengal, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
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3
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Sah MK, Mukherjee S, Saha S, Naskar K, Adhikari S. Photoelectron spectra of benzene: Can path dependent diabatic surfaces provide unique observables? J Chem Phys 2023; 159:244116. [PMID: 38153145 DOI: 10.1063/5.0177186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 11/30/2023] [Indexed: 12/29/2023] Open
Abstract
While carrying out Beyond Born-Oppenheimer theory based diabatization, the solutions of adiabatic-to-diabatic transformation equations depend on the paths of integration over two-dimensional cross-sections of multi-dimensional space of nuclear degrees of freedom. It is shown that such path-dependent solutions leading to diabatic potential energy surface matrices computed along any two different paths are related through an orthogonal matrix, and thereby, those surface matrices should provide unique observables. While exploring the numerical validity of the theoretical framework, we construct diabatic Hamiltonians for the five low-lying electronic states (X̃2E1g, B̃2E2g, and C̃2A2u) of benzene radical cation (C6H6+) along three different approaches of contour integration over two dimensional nuclear planes constituted by seven non-adiabatically active normal modes. Three different diabatic surface matrices are further employed to generate the photoelectron spectra of the benzene molecule (C6H6). It is interesting to note that the spectral peak positions and intensity patterns for all three cases are almost close to each other and also exhibit very good agreement with the experimental results.
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Affiliation(s)
- Mantu Kumar Sah
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Swagato Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Koushik Naskar
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Naskar K, Ravi S, Adhikari S, Baer M, Sathyamurthy N. Beyond Born-Oppenheimer Constructed Diabatic Potential Energy Surfaces for HeH 2. J Phys Chem A 2023; 127:3832-3847. [PMID: 37098130 DOI: 10.1021/acs.jpca.3c01047] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
First-principles based beyond Born-Oppenheimer theory has been employed to construct multistate global Potential-Energy Surfaces (PESs) for the HeH2+ system by explicitly incorporating the Nonadiabatic Coupling Terms (NACTs). Adiabatic PESs and NACTs for the lowest four electronic states (12A', 22A', 32A' and 42A') are evaluated as functions of hyperangles for a grid of fixed values of the hyperradius in hyperspherical coordinates. Conical intersection between different states are validated by integrating the NACTs along appropriately chosen contours. Subsequently, adiabatic-to-diabatic (ADT) transformation angles are determined by solving the ADT equations to construct the diabatic potential matrix for the HeH2+ system which are smooth, single-valued, continuous, and symmetric and are suitable for performing accurate scattering calculations for the titled system.
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Affiliation(s)
- Koushik Naskar
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Satyam Ravi
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
- School of Advanced Sciences and Languages VIT Bhopal University, Bhopal, 466114, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science 2A & 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Michael Baer
- The Fritz Haber Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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Mukherjee S, Ravi S, Dutta J, Sardar S, Adhikari S. Beyond Born-Oppenheimer based diabatic surfaces of 1,3,5-C 6H 3F 3+ to generate the photoelectron spectra using time-dependent discrete variable representation approach. Phys Chem Chem Phys 2022; 24:2185-2202. [PMID: 35006221 DOI: 10.1039/d1cp04733g] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this article, Beyond Born-Oppenheimer (BBO) treatment is implemented to construct diabatic potential energy surfaces (PESs) of 1,3,5-C6H3F3+ over a series [eighteen (18)] of two-dimensional (2D) nuclear planes constituted with eleven normal modes (Q2, Q9x, Q9y, Q13x, Q13y, Q18x, Q18y, Q10x, Q10y, Q12x and Q12y) to include all possible nonadiabatic interactions among six coupled electronic states (X̃2E'', , B̃2E' and ). We had formulated explicit expressions of adiabatic to diabatic transformation (ADT) equations [S. Mukherjee, J. Dutta, B. Mukherjee, S. Sardar and S. Adhikari, J. Chem. Phys., 2019, 150, 064308] for the same system forming six state sub-Hilbert space and at present, these ADT equations are solved by incorporating MRCI level ab initio adiabatic PESs and CP-MCSCF calculated nonadiabatic coupling terms (NACTs) to derive diabatic PESs and couplings. Such single-valued, smooth, symmetric and continuous diabatic surface matrices are utilized to carry out multi-state multi-mode nuclear dynamics with the help of time-dependent discrete variable representation (TDDVR) methodology to compute the photoelectron (PE) spectra of 1,3,5-C6H3F3. Our theoretically calculated spectra for X̃2E'', and states using BBO treatment and TDDVR dynamics show peak by peak correspondence with the experimental results as well as better than the findings of the multi-configuration time-dependent Hartree (MCTDH) method.
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Affiliation(s)
- Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700032, India.
| | - Satyam Ravi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700032, India. .,School of Advance Science and Languages, VIT Bhopal University, Bhopal - 466114, India
| | - Joy Dutta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700032, India.
| | - Subhankar Sardar
- Department of Chemistry, Bhatter College, Dantan, Paschim Medinipur - 721426, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700032, India.
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Mukherjee S, Ravi S, Naskar K, Sardar S, Adhikari S. A beyond Born–Oppenheimer treatment of C6H6+ radical cation for diabatic surfaces: Photoelectron spectra of its neutral analog using time-dependent discrete variable representation. J Chem Phys 2021; 154:094306. [DOI: 10.1063/5.0040361] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Satyam Ravi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Koushik Naskar
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Subhankar Sardar
- Department of Chemistry, Bhatter College, Dantan, Paschim Medinipur 721426, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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7
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Dutta J, Mukherjee S, Naskar K, Ghosh S, Mukherjee B, Ravi S, Adhikari S. The role of electron-nuclear coupling on multi-state photoelectron spectra, scattering processes and phase transitions. Phys Chem Chem Phys 2020; 22:27496-27524. [PMID: 33283826 DOI: 10.1039/d0cp04052e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present first principle based beyond Born-Oppenheimer (BBO) theory and its applications on various models as well as realistic spectroscopic and scattering processes, where the Jahn-Teller (JT) theory is brought in conjunction with the BBO approach on the phase transition of lanthanide complexes. Over one and half decades, our development of BBO theory is demonstrated with ab initio calculations on representative molecules of spectroscopic interest (NO2 radical, Na3 and K3 clusters, NO3 radical, C6H6+ and 1,3,5-C6H3F3+ radical cations) as well as triatomic reactive scattering processes (H+ + H2 and F + H2). Such an approach exhibits the effect of JT, Renner-Teller (RT) and pseudo Jahn-Teller (PJT) type of interactions. While implementing the BBO theory, we generate highly accurate diabatic potential energy surfaces (PESs) to carry out quantum dynamics calculation and find excellent agreement with experimental photoelectron spectra of spectroscopic systems and cross-sections/rate constants of scattering processes. On the other hand, such electron-nuclear couplings incorporated through JT theory play a crucial role in dictating higher energy satellite transitions in the dielectric function spectra of the LaMnO3 complex. Overall, this article thoroughly sketches the current perspective of the BBO approach and its connection with JT theory with various applications on physical and chemical processes.
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Affiliation(s)
- Joy Dutta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.
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8
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Mukherjee B, Naskar K, Mukherjee S, Ravi S, Shamasundar KR, Mukhopadhyay D, Adhikari S. Beyond Born-Oppenheimer constructed diabatic potential energy surfaces for F + H 2 reaction. J Chem Phys 2020; 153:174301. [PMID: 33167635 DOI: 10.1063/5.0021885] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
First principles based beyond Born-Oppenheimer theory has been implemented on the F + H2 system for constructing multistate global diabatic Potential Energy Surfaces (PESs) through the incorporation of Nonadiabatic Coupling Terms (NACTs) explicitly. The spin-orbit (SO) coupling effect on the collision process of the F + H2 reaction has been included as a perturbation to the non-relativistic electronic Hamiltonian. Adiabatic PESs and NACTs for the lowest three electronic states (12A', 22A', and 12A″) are determined in hyperspherical coordinates as functions of hyperangles for a grid of fixed values of the hyperradius. Jahn-Teller (JT) type conical intersections between the two A' states translate along C2v and linear geometries in F + H2. In addition, A' and A″ states undergo Renner-Teller (RT) interaction at collinear configurations of this system. Both JT and RT couplings are validated by integrating NACTs along properly chosen contours. Subsequently, we have solved adiabatic-to-diabatic transformation (ADT) equations to evaluate the ADT angles for constructing the diabatic potential matrix of F + H2, including the SO coupling terms. The newly calculated diabatic PESs are found to be smooth, single-valued, continuous, and symmetric and can be invoked for performing accurate scattering calculations on the F + H2 system.
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Affiliation(s)
- Bijit Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Koushik Naskar
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Satyam Ravi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - K R Shamasundar
- Department of Chemical Science, Indian Institute of Science Education and Research, Mohali, India
| | | | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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9
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Richings GW, Habershon S. A new diabatization scheme for direct quantum dynamics: Procrustes diabatization. J Chem Phys 2020; 152:154108. [DOI: 10.1063/5.0003254] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Gareth W. Richings
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Scott Habershon
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, United Kingdom
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10
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Naskar K, Mukherjee S, Mukherjee B, Ravi S, Mukherjee S, Sardar S, Adhikari S. ADT: A Generalized Algorithm and Program for Beyond Born–Oppenheimer Equations of “N” Dimensional Sub-Hilbert Space. J Chem Theory Comput 2020; 16:1666-1680. [DOI: 10.1021/acs.jctc.9b00948] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Koushik Naskar
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Bijit Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Satyam Ravi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Saikat Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Subhankar Sardar
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
- Department of Chemistry, Bhatter College, Dantan, Paschim Medinipur 721426, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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Gupta AK, Dhindhwal V, Baer M, Sathyamurthy N, Ravi S, Mukherjee S, Mukherjee B, Adhikari S. Non-adiabatic coupling and conical intersection(s) between potential energy surfaces for HeH2+. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1683243] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Ankur Kumar Gupta
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Manauli, India
- Department of Chemistry, Indiana University Bloomington, United States
| | - Vikash Dhindhwal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Manauli, India
| | - Michael Baer
- The Fritz Haber Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Narayanasami Sathyamurthy
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Manauli, India
- Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India
| | - Satyam Ravi
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, India
| | - Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, India
| | - Bijit Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, India
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12
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Mukherjee B, Naskar K, Mukherjee S, Ghosh S, Sahoo T, Adhikari S. Beyond Born–Oppenheimer theory for spectroscopic and scattering processes. INT REV PHYS CHEM 2019. [DOI: 10.1080/0144235x.2019.1672987] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Bijit Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
| | - Koushik Naskar
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
| | - Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
| | - Sandip Ghosh
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
| | - Tapas Sahoo
- Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India
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13
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Mukherjee S, Mukherjee B, Sardar S, Adhikari S. Extended Born-Oppenheimer equations for non-Abelian situations: A study on NO3 radical and 1,3,5-C6H3F3+ radical cation. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.03.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Mukherjee S, Dutta J, Mukherjee B, Sardar S, Adhikari S. Conical intersections and nonadiabatic coupling terms in 1,3,5-C6H3F3+: A six state beyond Born-Oppenheimer treatment. J Chem Phys 2019; 150:064308. [DOI: 10.1063/1.5064519] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Soumya Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata
700032, India
| | - Joy Dutta
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata
700032, India
| | - Bijit Mukherjee
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata
700032, India
| | - Subhankar Sardar
- Department of Chemistry, Bhatter College, Dantan, Paschim Medinipur 721426,
India
| | - Satrajit Adhikari
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata
700032, India
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15
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Mukherjee B, Mukhopadhyay D, Adhikari S, Baer M. Topological study of the H3++ molecular system: H3++ as a cornerstone for building molecules during the Big Bang. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1442940] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Bijit Mukherjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata, India
| | | | - Satrajit Adhikari
- Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata, India
| | - Michael Baer
- The Fritz Haber Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem, Israel
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16
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Mukherjee S, Mukherjee B, Adhikari S. Five Electronic State Beyond Born-Oppenheimer Equations and Their Applications to Nitrate and Benzene Radical Cation. J Phys Chem A 2017; 121:6314-6326. [PMID: 28735536 DOI: 10.1021/acs.jpca.7b04592] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We present explicit form of Adiabatic to Diabatic Transformation (ADT) equations and expressions of non-adiabatic coupling terms (NACTs) for a coupled five-state electronic manifold in terms of ADT angles between electronic wave functions. ADT matrices eliminate the numerical instability arising from singularity of NACTs and transform the adiabatic Schrödinger equation to its diabatic form. Two real molecular systems NO3 and C6H6+ (Bz+) are selectively chosen for the demonstration of workability of those equations. We examine the NACTs among the lowest five electronic states of the NO3 radical [X̃2A2' (12B2), Ã2E″ (12A2 and 12B1) and B̃2E' (12A1 and 22B2)], in which all types of non-adiabatic interactions, that is, Jahn-Teller (JT) interactions, Pseudo Jahn-Teller (PJT) interactions, and accidental conical intersections (CIs) are present. On the other hand, lowest five electronic states of Bz+ [X̃2E1g (12B3g and 12B2g), B̃2E2g (12Ag and 12B1g), and C̃2A2u (12B1u)] depict similar kind of complex feature of non-adiabatic effects. For NO3 radical, the two components of degenerate in-plane asymmetric stretching mode are taken as a plane of nuclear configuration space (CS), whereas in case of Bz+, two pairs are chosen: One is the pair of components of degenerate in-plane asymmetric stretching mode, and the other one is constituted with one of the components each from out-of-plane degenerate bend and in-plane degenerate asymmetric stretching modes. We calculate ab initio adiabatic potential energy surfaces (PESs) and NACTs among the lowest five electronic states at the CASSCF level using MOLPRO quantum chemistry package. Subsequently, the ADT is performed using those newly developed equations to validate the positions of the CIs, evaluate the ADT angles and construct smooth, symmetric, and continuous diabatic PESs for both the molecular systems.
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Affiliation(s)
- Soumya Mukherjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700 032, India
| | - Bijit Mukherjee
- Department of Physical Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700 032, India
| | - Satrajit Adhikari
- Department of Physical Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700 032, India
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17
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Dhindhwal V, Baer M, Sathyamurthy N. Study of Topological Effects Concerning the Lowest A″ and the Three A′ States for the CO2+ Ion. J Phys Chem A 2015; 120:2999-3008. [DOI: 10.1021/acs.jpca.5b08921] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vikash Dhindhwal
- Department
of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Manauli, Punjab 140306, India
| | - Michael Baer
- Department
of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Manauli, Punjab 140306, India
- The
Fritz Haber Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 9190501, Israel
| | - N. Sathyamurthy
- Department
of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Manauli, Punjab 140306, India
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18
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Richings GW, Worth GA. A Practical Diabatisation Scheme for Use with the Direct-Dynamics Variational Multi-Configuration Gaussian Method. J Phys Chem A 2015; 119:12457-70. [DOI: 10.1021/acs.jpca.5b07921] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gareth W. Richings
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
| | - Graham A. Worth
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, U.K
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19
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Srivastava S, Baer M, Sathyamurthy N. Jahn–Teller and coupled Jahn–Teller/Renner–Teller effects in the calculation of adiabatic-to-diabatic transformation angle for the lowest three2A′ states of NH2(NHH). Mol Phys 2014. [DOI: 10.1080/00268976.2014.948089] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Csehi A, Bende A, Halász GJ, Vibók Á, Das A, Mukhopadhyay D, Mukherjee S, Adhikari S, Baer M. Dressed Adiabatic and Diabatic Potentials To Study Topological Effects for F + H2. J Phys Chem A 2014; 118:6361-6. [DOI: 10.1021/jp412738s] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A. Csehi
- Department
of Information Technology, University of Debrecen, H-4010 Debrecen, P.O. Box 12, Hungary
| | - A. Bende
- Molecular
and Biomolecular Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, 400293 Cluj-Napoca, Romania
| | - G. J. Halász
- Department
of Information Technology, University of Debrecen, H-4010 Debrecen, P.O. Box 12, Hungary
| | - Á. Vibók
- Department
of Theoretical Physics, University of Debrecen, H-4010 Debrecen, P.O. Box 5, Hungary
| | - A. Das
- Department
of Chemistry, University of Calcutta, Kolkata 700 009, India
| | - D. Mukhopadhyay
- Department
of Chemistry, University of Calcutta, Kolkata 700 009, India
| | - S. Mukherjee
- Department
of Physical Chemistry, Indian Association for Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - S. Adhikari
- Department
of Physical Chemistry, Indian Association for Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - M. Baer
- The
Fritz
Haber Research Center for Molecular Dynamics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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21
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Das A, Mukhopadhyay D. Study of nonadiabatic effects in low-lying electronic states of HCNH with implication in its dissociation to HCN and HNC. J Phys Chem A 2013; 117:8680-90. [PMID: 23675649 DOI: 10.1021/jp403068v] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Abnormal abundance of HNC in interstellar spaces has been the motivation of many experimental as well as theoretical studies of the branching ratio [HNC]/[HCN] in the dissociation of HCNH, right after its formation from electron capture by HCNH(+), available in the upper atmosphere. In the present work we were interested in nonadiabatic studies involving the dissociation channel of HCNH leading to the formation of HNC. This study reports for the first time that the conical intersection (CI) between the states 1(2)Σ(+) and 2(2)Σ(+) exists only in some bent geometry (and not in the collinear geometry) where both of these states have A' symmetry. This finding is important as this CI is crucial in the dissociation of HCNH. We further report that these two states strongly couple with 1(2)Π, the lowest electronic state of collinear HCNH. Hence we construct a three-state Hilbert subspace (HSS), comprising of the states 1(2)Π, 1(2)Σ(+), and 2(2)Σ(+), in a configuration space where these states interact very strongly and the adiabatic-to-diabatic transformation angles (mixing angle) yield meaningful values of topological (Berry) phase. This leads to the construction of the corresponding three-state diabatic potentials. We advocate that these diabatic potentials, considering both the linear as well as bent configurations, nicely elucidate the formation of the HNC molecule by the CH bond dissociation of HCNH molecule.
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Affiliation(s)
- Anita Das
- Department of Chemistry, University of Calcutta , Kolkata - 700009, India
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22
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Mukherjee S, Bandyopadhyay S, Paul AK, Adhikari S. Construction of Diabatic Hamiltonian Matrix from ab Initio Calculated Molecular Symmetry Adapted Nonadiabatic Coupling Terms and Nuclear Dynamics for the Excited States of Na3 Cluster. J Phys Chem A 2013; 117:3475-95. [DOI: 10.1021/jp311597c] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Saikat Mukherjee
- Department of Physical Chemistry
and Raman Center for Atom, Molecule and Optical Sciences, Indian Association for the Cultivation of Science,
Jadavpur, Kolkata 700 032, India
| | | | - Amit Kumar Paul
- Department of Physical Chemistry
and Raman Center for Atom, Molecule and Optical Sciences, Indian Association for the Cultivation of Science,
Jadavpur, Kolkata 700 032, India
| | - Satrajit Adhikari
- Department of Physical Chemistry
and Raman Center for Atom, Molecule and Optical Sciences, Indian Association for the Cultivation of Science,
Jadavpur, Kolkata 700 032, India
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23
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Csehi A, Bende A, Halász GJ, Vibók Á, Das A, Mukhopadhyay D, Mukherjee S, Adhikari S, Baer M. Dressed Adiabatic and Diabatic Potentials for the Renner–Teller/Jahn–Teller F + H2 System. J Phys Chem A 2013; 117:8497-505. [DOI: 10.1021/jp311014z] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- A. Csehi
- Department of Information
Technology, University of Debrecen, P.O. Box 12, H-4010 Debrecen, Hungary
| | - A. Bende
- Molecular and Biomolecular
Physics Department, National Institute for Research and Development of Isotopic and Molecular Technologies, Cluj-Napoca, Romania
| | - G. J. Halász
- Department of Information
Technology, University of Debrecen, P.O. Box 12, H-4010 Debrecen, Hungary
| | - Á. Vibók
- Department of Theoretical
Physics, University of Debrecen, P.O. Box 5, H-4010 Debrecen, Hungary
| | - A. Das
- Department of Chemistry, University of Calcutta, Kolkata 700
009, India
| | - D. Mukhopadhyay
- Department of Chemistry, University of Calcutta, Kolkata 700
009, India
| | - S. Mukherjee
- Department of Physical
Chemistry, Indian Association for Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - S. Adhikari
- Department of Physical
Chemistry, Indian Association for Cultivation of Science, Jadavpur, Kolkata 700 032, India
| | - Michael Baer
- Department of Physical
Chemistry, Indian Association for Cultivation of Science, Jadavpur, Kolkata 700 032, India
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25
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Csehi A, Bende A, Halász GJ, Vibók Á, Das A, Mukhopadhyay D, Baer M. A tri-atomic Renner-Teller system entangled with Jahn-Teller conical intersections. J Chem Phys 2013; 138:024113. [PMID: 23320674 DOI: 10.1063/1.4773352] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The present study concentrates on a situation where a Renner-Teller (RT) system is entangled with Jahn-Teller (JT) conical intersections. Studies of this type were performed in the past for contours that surround the RT seam located along the collinear axis [see, for instance, G. J. Halász, Á. Vibók, R. Baer, and M. Baer, J. Chem. Phys. 125, 094102 (2006)]. The present study is characterized by planar contours that intersect the collinear axis, thus, forming a unique type of RT-non-adiabatic coupling terms (NACT) expressed in terms of Dirac-δ functions. Consequently, to calculate the required adiabatic-to-diabatic (mixing) angles, a new approach is developed. During this study we revealed the existence of a novel molecular parameter, η, which yields the coupling between the RT and the JT NACTs. This parameter was found to be a pure number η = 22/π (and therefore independent of any particular molecular system) and is designated as Renner-Jahn coupling parameter. The present study also reveals an unexpected result of the following kind: It is well known that each (complete) group of states, responsible for either the JT-effect or the RT-effect, forms a Hilbert space of its own. However, the entanglement between these two effects forms a third effect, namely, the RT/JT effect and the states that take part in it form a different Hilbert space.
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Affiliation(s)
- A Csehi
- Department of Information Technology, University of Debrecen, H-4010 Debrecen, P.O. Box 12, Hungary
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26
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Das A, Mukhopadhyay D. Jahn-Teller intersections induced by introduction of bending in linear polyatomics: study with HCNH, a selected molecular system. J Phys Chem A 2012; 116:1774-85. [PMID: 22313095 DOI: 10.1021/jp208684p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Demonstration of onset of Jahn-Teller (JT) intersections, characterized by a topological phase of π, on introduction of bending in the collinear tetra-atomic C(2)H(2)(+) cation, originally a Renner-Teller (RT) system, has raised interest in the study of the generality of this phenomenon. This interest has initiated similar study by shifting one external light atom from the collinear molecular axes of systems such as HCNH and HC(2)O. Recent studies have revealed that slightly bent HCNH poses a specialty in this regard and thus demands focused attention. In the present work we performed a combined study using both the potential intersections and the angular nonadiabatic coupling terms (NACTs) and report two new results: (i) The first result is the appearance of the JT conical intersections (ci's) between the two lowest states of a slightly bent HCNH molecule (1(2)A' and 1(2)A", originated from collinear X(2)Π state) only with certain nonplanar configurations, in contrast to its appearance in C(S) configuration space (molecular plane) for slightly bent C(2)H(2)(+), HC(2)O, or some other tetra-atomics. This is also associated with the first time demonstration of Berry phase for such a single isolated ci for HCNH molecule. (ii) For energetically higher potentials of slightly bent HCNH, the present study reveals the existence of the intersection of the state 1(2)A" with the state 2(2)A' (originated from the collinear 1(2)Σ(+) state); in contrast to the (1,2) ci this appears in the molecular plane. The search for ci's has been performed by varying the distances of the two H-atoms (designated as H(C) and H(N)) from the C-N axis as well as the dihedral angle φ between the two planes (H(C),C,N) and (C,N,H(N)). Existence of these JT ci's results in deterioration of a two-state Hilbert subspace (HSS) model in diabatization, while the proper choice of an n (>2)-state HSS circumvents this problem.
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Affiliation(s)
- Anita Das
- Department of Chemistry, University of Calcutta, Kolkata 700009, India
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27
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Das A, Sahoo T, Mukhopadhyay D, Adhikari S, Baer M. Dressed adiabatic and diabatic potentials to study conical intersections for F + H2. J Chem Phys 2012; 136:054104. [DOI: 10.1063/1.3679406] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Das A, Mukhopadhyay D, Adhikari S, Baer M. Derivation of diabatic potentials for F+H2 employing non-adiabatic coupling terms. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.09.072] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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29
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Paul AK, Ray S, Mukhopadhyay D, Adhikari S. Ab initio calculations on the excited states of Na3 cluster to explore beyond Born-Oppenheimer theories: Adiabatic to diabatic potential energy surfaces and nuclear dynamics. J Chem Phys 2011; 135:034107. [PMID: 21786987 DOI: 10.1063/1.3609247] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Amit Kumar Paul
- Department of Physical Chemistry and Raman Center for Atom, Molecule and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
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30
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Das A, Mukhopadhyay D, Adhikari S, Baer M. Renner-Teller intersections along the collinear axes of polyatomic molecules: H2CN as a case study. J Chem Phys 2010; 133:084107. [PMID: 20815560 DOI: 10.1063/1.3479399] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The tetra-atomic C(2)H(2)(+) cation is known to form Renner-Teller-type intersections along its collinear axis. Not too long ago, we studied the nonadiabatic coupling terms (NACTs) of this molecule [G. J. Halász et al., J. Chem. Phys. 126, 154309 (2007)] and revealed two kinds of intersections. (i) By employing one of the hydrogens as a test particle, we revealed the fact that indeed the corresponding (angular) NACTs produce topological (Berry) phases that are equal to 2pi, which is a result anticipated in the case of Renner-Teller intersections. (ii) However, to our big surprise, repeating this study when one of the atoms (in this case a hydrogen) is shifted from the collinear arrangement yields for the corresponding topological phase a value that equals pi (and not 2pi). In other words, shifting (even slightly) one of the atoms from the collinear arrangement causes the intersection to change its character and become a Jahn-Teller intersection. This somewhat unexpected novel result was later further analyzed and confirmed by other groups [e.g., T. Vertesi and R. Englman, J. Phys. B 41, 025102 (2008)]. The present article is devoted to another tetra-atomic molecule, namely, the H(2)CN molecule, which just like the C(2)H(2)(+) ion, is characterized by Renner-Teller intersections along its collinear axis. Indeed, we revealed the existence of Renner-Teller intersections along the collinear axis, but in contrast to the C(2)H(2)(+) case a shift of one atom from the collinear arrangement did not form Jahn-Teller intersections. What we found instead is that the noncollinear molecule was not affected by the shift and kept its Renner-Teller character. Another issue treated in this article is the extension of (the two-state) Berry (topological) phase to situations with numerous strongly interacting states. So far the relevance of the Berry phase was tested for systems characterized by two isolated interacting states, although it is defined for any number of interacting states [M. V. Berry, Proc. R. Soc. London, Ser. A 392, 45 (1984)]. We intend to show how to overcome this limitation and get a valid, fully justified definition of a Berry phase for an isolated system of any number of interacting states (as is expected).
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Affiliation(s)
- Anita Das
- Department of Chemistry, University of Calcutta, Kolkata 700 009, India
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31
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Kumar Paul A, Sardar S, Sarkar B, Adhikari S. Single surface beyond Born–Oppenheimer equation for a three-state model Hamiltonian of Na3 cluster. J Chem Phys 2009; 131:124312. [PMID: 19791886 DOI: 10.1063/1.3236839] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Amit Kumar Paul
- Department of Physical Chemistry and Raman Center for Atom, Molecule and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
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32
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Sarkar B, Adhikari S. Curl condition for a four-state Born-Oppenheimer system employing the Mathieu equation. J Phys Chem A 2008; 112:9868-85. [PMID: 18785688 DOI: 10.1021/jp8029709] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
When a group of four states forms a subspace of the Hilbert space, i.e., appears to be strongly coupled with each other but very weakly interacts with all other states of the entire space, it is possible to express the nonadiabatic coupling (NAC) elements either in terms of s or in terms of electronic basis function angles, namely, mixing angles presumably representing the same sub-Hilbert space. We demonstrate that those explicit forms of the NAC terms satisfy the curl conditions--the necessary requirements to ensure the adiabatic-diabatic transformation in order to remove the NAC terms (could be often singular also at specific point(s) or along a seam in the configuration space) in the adiabatic representation of nuclear SE and to obtain the diabatic one with smooth functional form of coupling terms among the electronic states. In order to formulate extended Born-Oppenheimer (EBO) equations [J. Chem. Phys. 2006, 124, 074101] for a group of four states, we show that there should exist a coordinate independent ratio of the gradients for each pair of ADT/mixing angles leading to zero curls and, thereafter, provide a brief discussion on its analytical validity. As a numerical justification, we consider the first four eigenfunctions of the Mathieu equation to demonstrate the interesting features of nonadiabatic coupling (NAC) elements, namely, the validity of curl conditions and the nature of curl equations around CIs.
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Affiliation(s)
- Biplab Sarkar
- Department of Chemistry, Indian Institute of Technology, Guwahati, Guwahati 781039, India
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33
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Papas BN, Schuurman MS, Yarkony DR. Determining quasidiabatic coupled electronic state Hamiltonians using derivative couplings: A normal equations based method. J Chem Phys 2008; 129:124104. [DOI: 10.1063/1.2978389] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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34
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Mikhonin AV, Asher SA. Direct UV Raman monitoring of 3(10)-helix and pi-bulge premelting during alpha-helix unfolding. J Am Chem Soc 2007; 128:13789-95. [PMID: 17044707 DOI: 10.1021/ja062269+] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We used UV resonance Raman (UVRR) spectroscopy exciting at approximately 200 nm within the peptide bond pi --> pi* transitions to selectively study the amide vibrations of peptide bonds during alpha-helix melting. The dependence of the amide frequencies on their Psi Ramachandran angles and hydrogen bonding enables us, for the first time, to experimentally determine the temperature dependence of the peptide bond Psi Ramachandran angle population distribution of a 21-residue mainly alanine peptide. These Psi distributions allow us to easily discriminate between alpha-helix, 3(10)-helix and pi-helix/bulge conformations, obtain their individual melting curves, and estimate the corresponding Zimm and Bragg parameters. A striking finding is that alpha-helix melting is more cooperative and shows a higher melting temperature than previously erroneously observed. These Psi distributions also enable the experimental determination of the Gibbs free energy landscape along the Psi reaction coordinate, which further allows us to estimate the free energy barriers along the AP melting pathway. These results will serve as a benchmark for the numerous untested theoretical studies of protein and peptide folding.
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Affiliation(s)
- Aleksandr V Mikhonin
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
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35
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Iavarone AT, Patriksson A, van der Spoel D, Parks JH. Fluorescence probe of Trp-cage protein conformation in solution and in gas phase. J Am Chem Soc 2007; 129:6726-35. [PMID: 17487969 DOI: 10.1021/ja065092s] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Measurements of protein unfolding in the absence of solvent, when combined with unfolding studies in solution, offer a unique opportunity to measure the effects of solvent on protein structure and dynamics. The experiments presented here rely on the fluorescence of an attached dye to probe the local conformational dynamics through interactions with a Trp residue and fields originating on charge sites. We present fluorescence measurements of thermal fluctuations accompanying conformational change of a miniprotein, Trp-cage, in solution and in gas phase. Molecular dynamics (MD) simulations are performed as a function of temperature, charge state, and charge location to elucidate the dye-protein conformational dynamics leading to the changes in measured fluorescence. The results indicate that the stability of the unsolvated protein is dominated by hydrogen bonds. Substituting asparagine for aspartic acid at position 9 results in a dramatic alteration of the solution unfolding curve, indicating that the salt bridge involving Lys8, Asp9, and Arg16 (+ - +) is essential for Trp-cage stability in solution. In contrast, this substitution results in minor changes in the unfolding curve of the unsolvated protein, showing that hydrogen bonds are the major contributor to the stability of Trp-cage in gas phase. Consistent with this hypothesis, the decrease in the number of hydrogen bonds with increasing temperature indicated by MD simulations agrees reasonably well with the experimentally derived enthalpies of conformational change. The simulation results display relatively compact conformations compared with NMR structures that are generally consistent with experimental results. The measured unfolding curves of unsolvated Trp-cage ions are invariant with the acetonitrile content of the solution from which they are formed, possibly as a result of conformational relaxation during or after desolvation. This work demonstrates the power of combined solution and gas-phase studies and of single-point mutations to identify specific noncovalent interactions which contribute to protein-fold stability. The combination of experiment and simulation is particularly useful because these approaches yield complementary information which can be used to deduce the details of structural changes of proteins in the gas phase.
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Affiliation(s)
- Anthony T Iavarone
- Rowland Institute at Harvard, 100 Edwin H. Land Boulevard, Cambridge, Massachusetts 02142, USA
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36
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Naganathan AN, Doshi U, Muñoz V. Protein folding kinetics: barrier effects in chemical and thermal denaturation experiments. J Am Chem Soc 2007; 129:5673-82. [PMID: 17419630 PMCID: PMC2527040 DOI: 10.1021/ja0689740] [Citation(s) in RCA: 104] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Recent experimental work on fast protein folding brings about an intriguing paradox. Microsecond-folding proteins are supposed to fold near or at the folding speed limit (downhill folding), but yet their folding behavior seems to comply with classical two-state analyses, which imply the crossing of high free energy barriers. However, close inspection of chemical and thermal denaturation kinetic experiments in fast-folding proteins reveals systematic deviations from two-state behavior. Using a simple one-dimensional free energy surface approach we find that such deviations are indeed diagnostic of marginal folding barriers. Furthermore, the quantitative analysis of available fast-kinetic data indicates that many microsecond-folding proteins fold downhill in native conditions. All of these proteins are then promising candidates for an atom-by-atom analysis of protein folding using nuclear magnetic resonance.1 We also find that the diffusion coefficient for protein folding is strongly temperature dependent, corresponding to an activation energy of approximately 1 kJ.mol-1 per protein residue. As a consequence, the folding speed limit at room temperature is about an order of magnitude slower than the approximately 1 micros estimates from high-temperature T-jump experiments. Our analysis is quantitatively consistent with the available thermodynamic and kinetic data on slow two-state folding proteins and provides a straightforward explanation for the apparent fast-folding paradox.
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Affiliation(s)
- Athi N. Naganathan
- Department of Chemistry and Biochemistry, and Center for Biomolecular Structure and Organization, University of Maryland, College Park, Maryland 20742, USA
| | - Urmi Doshi
- Department of Chemistry and Biochemistry, and Center for Biomolecular Structure and Organization, University of Maryland, College Park, Maryland 20742, USA
| | - Victor Muñoz
- Department of Chemistry and Biochemistry, and Center for Biomolecular Structure and Organization, University of Maryland, College Park, Maryland 20742, USA
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37
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Yang S, Cho M. Thermal Denaturation of Polyalanine Peptide in Water by Molecular Dynamics Simulations and Theoretical Prediction of Infrared Spectra: Helix−Coil Transition Kinetics. J Phys Chem B 2007; 111:605-17. [PMID: 17228919 DOI: 10.1021/jp0649091] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Perspectives in the helix-coil transition kinetics of secondary structures are examined by temperature-jump molecular dynamics (T-jump MD) simulations and theoretically calculated infrared (IR) spectra. Homopolymeric polyalanine, Ac-(A)(21)-NHMe (A21), is unfolded in water by T-jumps from 273 to 300 K approximately 450 K using AMBER ff99 and ff03 force fields. MD simulation results provide in silico evidence that 3(10)-helix and type I beta-turn motifs are highly probable in both ff99 and ff03 results. Temperature-dependent difference IR spectra of A21 do not possess an isosbestic point in both results, and isotope-labeled difference IR spectra in ff03 results predict characteristic profiles observed in experiments. Unfolding rates obtained from simulated time-resoled IR spectra are in good agreement with those estimated by helical contents, but they are still an order of magnitude smaller than experimental values. We demonstrate that the conventional criteria such as single-exponential fit of transient amide I absorbance, sigmoidal fit of temperature-dependent amide I absorbance, and Arrhenius plot of relaxation rates cannot guarantee the validity of assuming a two-state mechanism. We suggest a way of determining T(m) by the temperature dependence of center frequency and full width at half-maximum of amide I band. Overall, both ff99 and ff03 force fields give consistent results in reproducing key aspects concerned experimentally, but are not predominantly satisfactory in quantitative aspects.
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Affiliation(s)
- Seongeun Yang
- Department of Chemistry and Center for Multidimensional Spectroscopy, Korea University, Seoul 136-701, Korea
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38
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Alijah A, Varandas AJC. H3+ in the electronic triplet state: current status. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2006; 364:2889-99; discussion 2899-901. [PMID: 17015382 DOI: 10.1098/rsta.2006.1882] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We review the theoretical work carried out on the tri-hydrogen ion in the electronic triplet state 1(3)E', which is split into a3Sigma+u and 2(3)A' by vibronic interaction. We begin with an overview on analytical potential energy surfaces and calculations of rovibrational states by focusing on our own results, which are based on the most accurate potential energy surfaces available so far. This is followed by an examination of the selection rules and predictions of infrared transition frequencies. Finally, we discuss the Slonczewski resonance states supported by the upper sheet of the potential energy surface. Theoretical work reported here may be of interest for future experiments on the title ion.
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Affiliation(s)
- Alexander Alijah
- Departamento de Química, Universidade de Coimbra, 3004-535 Coimbra, Portugal.
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39
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Iavarone AT, Duft D, Parks JH. Shedding Light on Biomolecule Conformational Dynamics Using Fluorescence Measurements of Trapped Ions. J Phys Chem A 2006; 110:12714-27. [PMID: 17125284 DOI: 10.1021/jp064933e] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Biomolecule conformational change has been widely investigated in solution using several methods; however, much less experimental data about structural changes are available for completely isolated, gas-phase biomolecules. Studies of conformational change in unsolvated biomolecules are required to complement the interpretation of mass spectrometry measurements and in addition, can provide a means to directly test theoretical simulations of biomolecule structure and dynamics independent of a simulated solvent. In this Feature Article, we review our recent introduction of a fluorescence-based method for probing local conformational dynamics in unsolvated biomolecules through interactions of an attached dye with tryptophan (Trp) residues and fields originating on charge sites. Dye-derivatized biomolecule ions are formed by electrospray ionization and are trapped in a variable-temperature quadrupole ion trap in which they are irradiated with either continuous or short pulse lasers to excite fluorescence. Fluorescence is measured as a function of temperature for different charge states. Optical measurements of the dye fluorescence include average intensity changes, changes in the emission spectrum, and time-resolved measurements of the fluorescence decay. These measurements have been applied to the miniprotein, Trp-cage, polyproline peptides and to a beta-hairpin-forming peptide, and the results are presented as examples of the broad applicability and utility of these methods. Model fits to Trp-cage fluorescence data measured as a function of temperature provide quantitative information on the thermodynamics of conformational changes, which are reproduced well by molecular dynamics. Time-resolved measurements of the fluorescence decays of Trp-cage and small polyproline peptides definitively demonstrate the occurrence of fluorescence quenching by the amino acid Trp in unsolvated biomolecules.
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Affiliation(s)
- Anthony T Iavarone
- The Rowland Institute at Harvard, 100 Edwin H. Land Boulevard, Cambridge, MA 02142, USA
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40
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Sarkar B, Adhikari S. Extended Born-Oppenheimer equation for a three-state system. J Chem Phys 2006; 124:74101. [PMID: 16497024 DOI: 10.1063/1.2170089] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present explicit forms of nonadiabatic coupling (NAC) elements of nuclear Schrodinger equation (SE) for a coupled three-state electronic manifold in terms of mixing angles of real electronic basis functions. If the adiabatic-diabatic transformation (ADT) angles are the mixing angles of electronic bases, ADT matrix transforms away the NAC terms and brings diabatic form of SE. ADT and NAC matrices are shown to satisfy a curl condition with nonzero divergence. We have demonstrated that the formulation of extended Born-Oppenheimer (EBO) equation from any three-state BO system is possible only when there exists a coordinate-independent ratio of the gradients for each pair of mixing angles. On the contrary, since such relations among the mixing angles lead to zero curl, we explore its validity analytically around conical intersection(s) and support numerically considering two nuclear-coordinate-dependent three surface BO models. Numerical calculations are performed by using newly derived diabatic and EBO equations and expected transition probabilities are obtained.
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Affiliation(s)
- Biplab Sarkar
- Department of Chemistry, Indian Institute of Technology, Guwahati, North Guwahati, India
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41
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Vértesi T, Bene E, Vibók A, Halász GJ, Baer M. N-State Adiabatic-to-Diabatic Transformation Angle: Theory and Application. J Phys Chem A 2005; 109:3476-84. [PMID: 16833685 DOI: 10.1021/jp044195z] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this article is discussed a new diabatization procedure which is expected to be reliable and, also, relatively easy to implement. This procedure takes into account the two main ingredients related to diabatization: (1) The size N of the smallest (relevant) group of states that forms a Hilbert subspace (this fact enforces the dimension of the adiabatic-to-diabatic transformation matrix to be N). (2) The total energy E which determines the number of open states, p, within this group of N states. The main emphasis in this manuscript is on the case that N is arbitrary but p is equal to 2. The various derivations as well as the final results are accompanied by numerical examples extracted from three- to five-state ab initio calculations for the H + H2 system.
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Affiliation(s)
- T Vértesi
- Department of Theoretical Physics, University of Debrecen, Debrecen, Hungary
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42
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Vu DM, Peterson ES, Dyer RB. Experimental resolution of early steps in protein folding: testing molecular dynamics simulations. J Am Chem Soc 2004; 126:6546-7. [PMID: 15161270 DOI: 10.1021/ja048416q] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Time-resolved Tyr fluorescence spectroscopy coupled with a laser-induced temperature-jump (T-jump) was employed to follow the folding relaxation dynamics of the B-domain of Staphylococcal protein A. The single Tyr is located in helix 1 (H1) and is a sensitive probe of the structure of this helix and the overall helical bundle structure. The results from this study were compared to those from a complementary infrared T-jump study on this protein [Vu, D. M.; Myers, J. K.; Oas, T. G.; Dyer, R. B. Biochemistry 2004, 43, 3582]. Both methods detect a microsecond process that follows the cooperative relaxation of the helical bundle core. However, a fast process (10-7 s) that follows the relaxation of the individual helices was observed only with the infrared probe. Thus, fast formation of H1 is not observed, but rather H1 forms in the microsecond phase, concomitantly with the docking to (and stabilization by) the other two helices to form the helical bundle structure. This observation validates the results of several previous molecular dynamics simulations that predict H1 formation only in the final assembly of the helix bundle.
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Affiliation(s)
- Dung M Vu
- Bioscience Division, MS J586, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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43
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Baer M, Vértesi T, Halász GJ, Vibók Á. Electronic Diabatic Framework: Restrictions Due to Quantization of the Nonadiabatic Coupling Matrix. J Phys Chem A 2004. [DOI: 10.1021/jp0487051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Baer
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
| | - T. Vértesi
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
| | - G. J. Halász
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
| | - Á. Vibók
- Soreq Nuclear Research Center, Yavne 81800, Israel, Department of Theoretical Physics and Institute of Informatics, University of Debrecen, Debrecen, Hungary
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44
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Freedberg DI, Venable RM, Rossi A, Bull TE, Pastor RW. Discriminating the Helical Forms of Peptides by NMR and Molecular Dynamics Simulation. J Am Chem Soc 2004; 126:10478-84. [PMID: 15315464 DOI: 10.1021/ja0484146] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The HNCO NMR pulse sequence was applied to three selectively labeled (15)N and (13)C isotopic homologues of the peptide Ac-WAAAH(AAARA)(3)A-NH(2) to probe directly for hydrogen bonds between residues 8 and 11 (characteristic of a 3(10)-helix), 8 and 12 (alpha-helix), and 8 and 13 (pi-helix). The experiments demonstrate conclusively, and in agreement with circular dichroism studies, that the center of the peptide is alpha-helical; there is no discernible 3(10)- or pi-helix at these specific positions. Molecular dynamics simulations of the preceding peptide and Ac-(AAAAK)(3)A-NH(2) in water using the potential energy parameter set CHARMM22/CMAP correctly yield an alpha-helix, in contrast to simulations with the set CHARMM22, which result in a pi-helix.
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Affiliation(s)
- Darón I Freedberg
- Contribution from the Laboratory of Biophysics, Center for Biologics Evaluation and Research, Food and Drug Administration, 1401 Rockville Pike, Rockville, MD 20852, USA
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45
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Doshi UR, Muñoz V. The Principles of α-Helix Formation: Explaining Complex Kinetics with Nucleation−Elongation Theory. J Phys Chem B 2004. [DOI: 10.1021/jp049896a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Urmi R. Doshi
- Department of Chemistry and Biochemistry and Center for Biomolecular Structure and Organization, University of Maryland, College Park, Maryland 20742
| | - Victor Muñoz
- Department of Chemistry and Biochemistry and Center for Biomolecular Structure and Organization, University of Maryland, College Park, Maryland 20742
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46
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Nonadiabatic Coupling: General Features and Relation to Molecular Properties. ADVANCES IN QUANTUM CHEMISTRY 2003. [DOI: 10.1016/s0065-3276(03)44008-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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47
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Matsika S, Yarkony DR. Accidental conical intersections of three states of the same symmetry. I. Location and relevance. J Chem Phys 2002. [DOI: 10.1063/1.1513304] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
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48
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Matsika S, Yarkony DR. Photodissociation of the vinoxy radical through conical, and avoided, intersections. J Chem Phys 2002. [DOI: 10.1063/1.1507587] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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49
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Margulis CJ, Stern HA, Berne BJ. Helix Unfolding and Intramolecular Hydrogen Bond Dynamics in Small α-Helices in Explicit Solvent. J Phys Chem B 2002. [DOI: 10.1021/jp0205158] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- C. J. Margulis
- Department of Chemistry, Columbia University, 3000 Broadway, New York City, New York 10027
| | - H. A. Stern
- Department of Chemistry, Columbia University, 3000 Broadway, New York City, New York 10027
| | - B. J. Berne
- Department of Chemistry, Columbia University, 3000 Broadway, New York City, New York 10027
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50
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Mebel AM, Halász GJ, Vibók Á, Alijah A, Baer M. Quantization of the 3×3 nonadiabatic coupling matrix for three coupled states of the C2H molecule. J Chem Phys 2002. [DOI: 10.1063/1.1483854] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
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