1
|
Lee H, Kim SK. Vibration mediated photodissociation dynamics of CH 3SH: manipulation of the dynamic energy disposal into products. Phys Chem Chem Phys 2020; 22:19713-19717. [PMID: 32840271 DOI: 10.1039/d0cp03575k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The S-H bond dissociation dynamics of CH3SH have been investigated for the S1-S0 transition mediated by either the S-H stretching (2608 cm-1) or CH3 symmetric stretching (2951 cm-1) mode excitation in the S0 state. The S-H and C-S bond extensions are strongly coupled in the S1 state through the S1/S2 same-symmetry conical intersection, giving the C-S stretching mode excitation of the CH3S˙ fragment during the prompt S-H bond rupture on S1. In the IR + UV transition mediated by the S-H stretching mode, the vertical transition seems to access the Franck-Condon region where the S-H bond is shortened while the coupling to the C-S bond stretching becomes stronger compared to the case of one-photon UV transition, indicating that the intramolecular vibrational redistribution (IVR) is little activated in S0. When the IR + UV excitation is mediated by the CH3 symmetric stretching mode, on the other hand, the Franck-Condon region in S1 encompasses the enlarged molecular structures with respect to both S-H and C-S bond extensions, presumably due to the rapid IVR in S0 prior to the vertical transition. This leads to the inverted vibrational state population of the C-S bond stretching mode of the CH3S˙ fragment. This work demonstrates that the reaction dynamics upon the IR + UV excitation of CH3SH is highly mode dependent and the energy disposal dynamics could be controlled by the manipulation of the Franck-Condon region through the particular vibrational-state mediation in the ground state, shedding new light on the structure-dynamics relationship.
Collapse
Affiliation(s)
- Heesung Lee
- Department of Chemistry, KAIST, Daejeon 34141, Republic of Korea.
| | - Sang Kyu Kim
- Department of Chemistry, KAIST, Daejeon 34141, Republic of Korea.
| |
Collapse
|
2
|
Svrčková P, Pysanenko A, Lengyel J, Rubovič P, Kočišek J, Poterya V, Slavíček P, Fárník M. Photodissociation dynamics of ethanethiol in clusters: complementary information from velocity map imaging, mass spectrometry and calculations. Phys Chem Chem Phys 2015; 17:25734-41. [DOI: 10.1039/c5cp00367a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We investigate the solvent effects on photodissociation dynamics of the S–H bond in ethanethiol CH3CH2SH (EtSH).
Collapse
Affiliation(s)
- Pavla Svrčková
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
- Department of Physical Chemistry
| | - Andriy Pysanenko
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
| | - Jozef Lengyel
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
- Department of Physical Chemistry
| | - Peter Rubovič
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
| | - Jaroslav Kočišek
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
| | - Viktoriya Poterya
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
| | - Petr Slavíček
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
- Department of Physical Chemistry
| | - Michal Fárník
- J. Heyrovský Institute of Physical Chemistry v.v.i
- The Czech Academy of Sciences
- 18223 Prague
- Czech Republic
| |
Collapse
|
3
|
Lei Y, Wang Y, Han H, Song Q, Suo B, Wen Z. New implementation of the configuration-based multi-reference second order perturbation theory. J Chem Phys 2012; 137:144102. [DOI: 10.1063/1.4757264] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
4
|
Chang SW, Witek HA. Choice of Optimal Shift Parameter for the Intruder State Removal Techniques in Multireference Perturbation Theory. J Chem Theory Comput 2012; 8:4053-61. [DOI: 10.1021/ct2006924] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shu-Wei Chang
- Department of Applied Chemistry and Institute of Molecular
Science, National Chiao Tung University, Hsinchu, Taiwan
| | - Henryk A. Witek
- Department of Applied Chemistry and Institute of Molecular
Science, National Chiao Tung University, Hsinchu, Taiwan
| |
Collapse
|
5
|
Chen Z, Shuai Q, Eppink ATJB, Jiang B, Dai D, Yang X, Parker DH. Imaging CH3SH photodissociation at 204 nm: the SH + CH3 channel. Phys Chem Chem Phys 2011; 13:8531-6. [PMID: 21451858 DOI: 10.1039/c1cp00032b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The SH + CH(3) product channel for the photodissociation of CH(3)SH at 204 nm was investigated using the sliced velocity map ion imaging technique with the detection of CH(3) products using state selective (2+1) resonance enhanced multiphoton ionization (REMPI). Images were measured for CH(3) formed in the ground and excited vibrational states (v(2) = 0, 1, and 2) of the umbrella mode from which the correlated SH vibrational state distributions were determined. The vibrational distribution of the SH fragment in the SH + CH(3) channel at 204 nm is clearly inverted and peaks at v = 1. The highly negative anisotropy parameter of the CH(3) (v(2) = 0, 1, and 2) products is indicative of a fast dissociation process for C-S bond cleavage. Two kinds of slower CH(3) products were also observed (one of which was partly vibrationally resolved) that are assigned to a two-step photodissociation processes, in which the first step is the production of the CH(3)S (X(2)E) radical via cleavage of the S-H bond in CH(3)SH, followed by probe laser photodissociation of nascent CH(3)S radicals yielding CH(3)(X(2)A(1), v(2) = 0-2) + S((3)P(j)/(1)D) products.
Collapse
Affiliation(s)
- Zhichao Chen
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, Dalian 116023, China
| | | | | | | | | | | | | |
Collapse
|
6
|
Ashfold MNR, King GA, Murdock D, Nix MGD, Oliver TAA, Sage AG. πσ* excited states in molecular photochemistry. Phys Chem Chem Phys 2010; 12:1218-38. [DOI: 10.1039/b921706a] [Citation(s) in RCA: 274] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
7
|
Scriven E, Powell BJ. Toward the parametrization of the Hubbard model for salts of bis(ethylenedithio)tetrathiafulvalene: A density functional study of isolated molecules. J Chem Phys 2009; 130:104508. [DOI: 10.1063/1.3080543] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
8
|
Chaudhuri RK, Hammond JR, Freed KF, Chattopadhyay S, Mahapatra US. Reappraisal ofciseffect in 1,2-dihaloethenes: An improved virtual orbital multireference approach. J Chem Phys 2008; 129:064101. [DOI: 10.1063/1.2958284] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
|
9
|
Izquierdo JG, Amaral GA, Ausfelder F, Aoiz FJ, Bañares L. Velocity map imaging study of the photodissociation of CH3SH: internal energy distribution of the SH fragment. Chemphyschem 2007; 7:1682-6. [PMID: 16810660 DOI: 10.1002/cphc.200600232] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jesús G Izquierdo
- Departamento de Química Física I. Facultad de Química, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | | | | | | | | |
Collapse
|
10
|
Thiel W. Perspectives on Semiempirical Molecular Orbital Theory. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470141526.ch10] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
|
11
|
Amaral GA, Ausfelder F, Izquierdo JG, Rubio-Lago L, Bañares L. Imaging the photodissociation of CH3SH in the first and second absorption bands: The CH3(X̃A12)+SH(XΠ2) channel. J Chem Phys 2007; 126:024301. [PMID: 17228948 DOI: 10.1063/1.2409925] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The CH3(X2A1)+SH(X2Pi) channel of the photodissociation of CH3SH has been investigated at several wavelengths in the first 1 1A"<--X 1A' and second 2 1A"<--X1A' absorption bands by means of velocity map imaging of the CH3 fragment. A fast highly anisotropic (beta=-1+/-0.1) CH3(X2A1) signal has been observed in the images at all the photolysis wavelengths studied, which is consistent with a direct dissociation process from an electronically excited state by cleavage of the C-S bond in the parent molecule. From the analysis of the CH3 images, vibrational populations of the SH(X2Pi) counterfragment have been extracted. In the second absorption band, the SH fragment is formed with an inverted vibrational distribution as a consequence of the forces acting in the crossing from the bound 2 1A" second excited state to the unbound 1 1A" first excited state. The internal energy of the SH radical increases as the photolysis wavelength decreases. In the case of photodissociation via the first excited state, the direct production of CH3 leaves the SH counterfragment with little internal excitation. Moreover, at the longer photolysis wavelengths corresponding to excitation to the 1 1A" state, a slower anisotropic CH3 channel has been observed (beta=-0.8+/-0.1) consistent with a two step photodissociation process, where the first step corresponds to the production of CH3S(X2E) radicals via cleavage of the S-H bond in CH3SH, followed by photodissociation of the nascent CH3S radicals yielding CH3(X2A1)+S(X3P0,1,2).
Collapse
Affiliation(s)
- G A Amaral
- Departamento de Quimica Fisica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | | | | | | | | |
Collapse
|
12
|
Chaudhuri RK, Freed KF. Relativistic effective valence shell Hamiltonian method: Excitation and ionization energies of heavy metal atoms. J Chem Phys 2005; 122:204111. [PMID: 15945717 DOI: 10.1063/1.1906206] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The relativistic effective valence shell Hamiltonian H(v) method (through second order) is applied to the computation of the low lying excited and ion states of closed shell heavy metal atoms/ions. The resulting excitation and ionization energies are in favorable agreement with experimental data and with other theoretical calculations. The nuclear magnetic hyperfine constants A and lifetimes tau of excited states are evaluated and they are also in accord with experiment. Some of the calculated quantities have not previously been computed.
Collapse
|
13
|
Chaudhuri RK, Freed KF. Generation of potential energy curves for the XΣg+1, BΔg+1, and B′Σg+1 states of C2 using the effective valence shell Hamiltonian method. J Chem Phys 2005; 122:154310. [PMID: 15945638 DOI: 10.1063/1.1879812] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Calculations of the ground and excited state potential energy curves of C2 using the third-order effective valence Hamiltonian (Hv3rd) method are benchmarked against full configuration interaction and other correlated single-reference perturbative and nonperturbative theories. The large nonparallelity errors (NPEs) exhibited even by state-of-art coupled cluster calculations through perturbative triples indicate a serious deficiency of these single-reference theories. The Hv method, on the other hand, produces a much reduced NPE, rendering it a viable approximate many-body method for accurately determining global ground and excited state potential energy curvessurfaces.
Collapse
|
14
|
Taylor CM, Chaudhuri RK, Freed KF. Electronic structure of the calcium monohydroxide radical. J Chem Phys 2005; 122:44317. [PMID: 15740258 DOI: 10.1063/1.1834511] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Effective valence shell Hamiltonian H(v) calculations are used to map out three-dimensional potential energy surfaces for the 12 lowest electronic states of the CaOH radical. Excitation energies and spectroscopic constants are compared with experiment and prior computations where available, but many previously unavailable data are provided, including excited state dipole moments and oscillator strengths. Particular attention is paid to clarify the nature of nonlinear and quasilinear excited states, Renner-Teller couplings, and state mixings. The F (2)Pi and G (2)Pi (6 (2)A(') and 8 (2)A(')) states are both found to possess nonlinear local minima, due to an avoided crossing. Attention is also focused on the characteristics of basis sets necessary in high-accuracy calculations for the CaOH radical.
Collapse
Affiliation(s)
- Caroline M Taylor
- James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, IL 60637, USA.
| | | | | |
Collapse
|
15
|
Abstract
To predict the branching between energetically allowed product channels, chemists often rely on statistical transition state theories or exact quantum scattering calculations on a single adiabatic potential energy surface. The potential energy surface gives the energetic barriers to each chemical reaction and allows prediction of the reaction rates. Yet, chemical reactions evolve on a single potential energy surface only if, in simple terms, the electronic wavefunction can evolve from the reactant electronic configuration to the product electronic configuration on a time scale that is fast compared to the nuclear dynamics through the transition state. The experiments reviewed here investigate how the breakdown of the Born-Oppenheimer approximation at a barrier along an adiabatic reaction coordinate can alter the dynamics of and the expected branching between molecular dissociation pathways. The work reviewed focuses on three questions that have come to the forefront with recent theory and experiments: Which classes of chemical reactions evidence dramatic nonadiabatic behavior that influences the branching between energetically allowed reaction pathways? How do the intramolecular distance and orientation between the electronic orbitals involved influence the nonadiabaticity in the reaction? How can the detailed nuclear dynamics mediate the effective nonadiabatic coupling encountered in a chemical reaction?
Collapse
Affiliation(s)
- L J Butler
- Department of Chemistry and The James Franck Institute, The University of Chicago, Chicago, Illinois 60637, USA.
| |
Collapse
|
16
|
Dudley TJ, Khait YG, Hoffmann MR. Molecular gradients for the second-order generalized Van Vleck variant of multireference perturbation theory. J Chem Phys 2003. [DOI: 10.1063/1.1579467] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
17
|
Witek HA, Choe YK, Finley JP, Hirao K. Intruder state avoidance multireference Møller-Plesset perturbation theory. J Comput Chem 2002; 23:957-65. [PMID: 12116401 DOI: 10.1002/jcc.10098] [Citation(s) in RCA: 180] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A new perturbation approach is proposed that enhances the low-order, perturbative convergence by modifying the zeroth-order Hamiltonian in a manner that enlarges any small-energy denominators that may otherwise appear in the perturbative expansion. This intruder state avoidance (ISA) method can be used in conjunction with any perturbative approach, but is most applicable to cases where small energy denominators arise from orthogonal-space states-so-called intruder states-that should, under normal circumstances, make a negligible contribution to the target state of interests. This ISA method is used with multireference Møller-Plesset (MRMP) perturbation theory on potential energy curves that are otherwise plagued by singularities when treated with (conventional) MRMP; calculation are performed on the 1(3)Sigma(-)(u) state of O(2); and the 2(1)Delta, 3(1)Delta, 2(3)Delta, and 3(3)Delta states of AgH. This approach is also applied to other calculations where MRMP is influenced by intruder states; calculations are performed on the (3)Pi(u) state of N(2), the (3)Pi state of CO, and the 2(1)A' state of formamide. A number of calculations are also performed to illustrate that this approach has little or no effect on MRMP when intruder states are not present in perturbative calculations; vertical excitation energies are computed for the low-lying states of N(2), C(2), CO, formamide, and benzene; the adiabatic (1)A(1)-(3)B(1) energy separation in CH(2), and the spectroscopic parameters of O(2) are also calculated. Vertical excitation energies are also performed on the Q and B bands states of free-base, chlorin, and zinc-chlorin porphyrin, where somewhat larger couplings exists, and-as anticipated-a larger deviation is found between MRMP and ISA-MRMP.
Collapse
Affiliation(s)
- Henryk A Witek
- Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan 113-8656
| | | | | | | |
Collapse
|
18
|
Choe YK, Witek HA, Finley JP, Hirao K. Identifying and removing intruder states in multireference Mo/ller–Plesset perturbation theory. J Chem Phys 2001. [DOI: 10.1063/1.1345510] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
19
|
Choe YK, Finley JP, Nakano H, Hirao K. On the performance of diagrammatic complete active space perturbation theory. J Chem Phys 2000. [DOI: 10.1063/1.1316044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
20
|
Chaudhuri RK, Majumder S, Freed KF. Determination of conformational energy differences of propynlidyne isomers using the effective valence shell Hamiltonian method. J Chem Phys 2000. [DOI: 10.1063/1.481551] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
21
|
Finley JP, Witek HA. Diagrammatic complete active space perturbation theory: Calculations on benzene, N2, and LiF. J Chem Phys 2000. [DOI: 10.1063/1.480947] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
22
|
Chiang SY, Ma CI, Shr DJ. Dissociative photoionization of CH3SSCH3 in the region of ∼8–25 eV. J Chem Phys 1999. [DOI: 10.1063/1.478826] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
23
|
Forde NR, Butler LJ, Abrash SA. Electronic accessibility of dissociation channels in an amide: N,N-dimethylformamide photodissociation at 193 nm. J Chem Phys 1999. [DOI: 10.1063/1.478898] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
24
|
Chaudhuri RK, Stevens JE, Freed KF. Evaluation of analytic molecular orbital derivatives and gradients using the effective valence shell Hamiltonian method. J Chem Phys 1998. [DOI: 10.1063/1.477638] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
25
|
Finley JP. Multireference perturbation theory with flexible energy denominators. J Chem Phys 1998. [DOI: 10.1063/1.477418] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
26
|
Chaudhuri RK, Das BP, Freed KF. Application of the effective valence shell Hamiltonian method to accurate estimation of oscillator strengths and excitation energies of Mg-like ions. J Chem Phys 1998. [DOI: 10.1063/1.475639] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
27
|
Finley JP. Similarities between single reference perturbation theory based on a CASSCF wavefunction and multireference perturbation theory based on a reference space spanned by a CAS. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(97)01410-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
28
|
|
29
|
Löwdin PO. Some Aspects on the Bloch-Lindgren Equation and A Comparison with the Partitioning Technique. ADVANCES IN QUANTUM CHEMISTRY 1998. [DOI: 10.1016/s0065-3276(08)60520-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
30
|
Chaudhuri RK, Freed KF. Comparison of high order perturbative convergence of multireference perturbation methods: Application to singlet states of CH2. J Chem Phys 1997. [DOI: 10.1063/1.474913] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
31
|
Chaudhuri RK, Mudholkar A, Freed KF, Martin CH, Sun H. Application of the effective valence shell Hamiltonian method to accurate estimation of valence and Rydberg states oscillator strengths and excitation energies for π electron systems. J Chem Phys 1997. [DOI: 10.1063/1.474026] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
32
|
Chaudhuri RK, Finley JP, Freed KF. Comparison of the perturbative convergence with multireference Möller–Plesset, Epstein–Nesbet, forced degenerate and optimized zeroth order partitionings: The excited BeH2surface. J Chem Phys 1997. [DOI: 10.1063/1.473188] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
33
|
Affiliation(s)
- Laurie J. Butler
- Department of Chemistry, University of Chicago, Chicago, Illinois 60637
| | - Daniel M. Neumark
- Department of Chemistry, University of California, Berkeley, California 94720, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
| |
Collapse
|
34
|
Martin CH, Freed KF. Ab initio computation of semiempirical π‐electron methods. V. Geometry dependence of Hν π‐electron effective integrals. J Chem Phys 1996. [DOI: 10.1063/1.472006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
35
|
Finley JP, Chaudhuri RK, Freed KF. Convergence behavior of multireference perturbation theory: Forced degeneracy and optimization partitioning applied to the beryllium atom. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 54:343-356. [PMID: 9913484 DOI: 10.1103/physreva.54.343] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
|
36
|
Martin CH. Redesigning semiempirical-like pi-electron theory with second order effective valence shell Hamiltonian (Hν) theory: application to large protonated Schiff bases. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(96)00548-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
37
|
Yarkony DR. On the role of conical intersections in photodissociation. V. Conical intersections and the geometric phase in the photodissociation of methyl mercaptan. J Chem Phys 1996. [DOI: 10.1063/1.471498] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
|
38
|
Johnson BR, Kittrell C, Kelly PB, Kinsey JL. Resonance Raman Spectroscopy of Dissociative Polyatomic Molecules. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp953436n] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bruce R. Johnson
- Department of Chemistry and Rice Quantum Institute, Rice University, Houston, Texas 77251-1892
| | - Carter Kittrell
- Department of Chemistry and Rice Quantum Institute, Rice University, Houston, Texas 77251-1892
| | - Peter B. Kelly
- Department of Chemistry and Rice Quantum Institute, Rice University, Houston, Texas 77251-1892
| | - James L. Kinsey
- Department of Chemistry and Rice Quantum Institute, Rice University, Houston, Texas 77251-1892
| |
Collapse
|
39
|
Lee SY, Freed KF. Ab initio study of cis‐butadiene valence and Rydberg states using the effective valence shell Hamiltonian method. J Chem Phys 1996. [DOI: 10.1063/1.471091] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
40
|
Finley JP, Chaudhuri RK, Freed KF. Applications of multireference perturbation theory to potential energy surfaces by optimal partitioning ofH: Intruder states avoidance and convergence enhancement. J Chem Phys 1995. [DOI: 10.1063/1.470586] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
41
|
Stevens JE, Jang HW, Butler LJ, Light JC. An adiabatic model for the photodissociation of CH3SH in the first ultraviolet absorption band. J Chem Phys 1995. [DOI: 10.1063/1.469099] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
|
42
|
Finley JP, Freed KF. Application of complete space multireference many‐body perturbation theory to N2: Dependence on reference space andH0. J Chem Phys 1995. [DOI: 10.1063/1.468919] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|