1
|
Dinu DF, Ončák M, Thorwirth S, Liedl KR, Brünken S, Schlemmer S, Jusko P. Zero-Point-Energy Driven Isotopic Exchange of the [H 3O] - anion Probed by Mid-Infrared Action Spectroscopy. J Am Chem Soc 2024. [PMID: 39049192 DOI: 10.1021/jacs.4c05543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2024]
Abstract
We present the first observation of vibrational transitions in the [H3O]- anion, an intermediate in the anion-molecule reaction of water, H2O, and hydride, H-, using a laser-induced isotopic H/D exchange reaction action spectroscopy scheme applied to anions. The observed bands are assigned as the fundamental and first overtone of the H2O-H- vibrational stretching mode, based on anharmonic calculations within the vibrational perturbation theory and vibrational configuration interaction. Although the D2O·D- species has the lowest energy, our experiments confirm the D2O·H- isotope to be a sink of the H/D exchange reaction. Ab initio calculations corroborate that the formation of D2O·H- is favored, as the zero-point-energy difference is larger between D2 and H2 than between D2O·H- and D2O·D-.
Collapse
Affiliation(s)
- Dennis F Dinu
- Institute of Materials Chemistry, TU Wien, Getreidemarkt 9/165, 1060 Vienna, Austria
- Department of General, Inorganic and Theoretical Chemistry, Universität Innsbruck, Innrain 80/82, 6020 Innsbruck, Austria
| | - Milan Ončák
- Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
| | - Sven Thorwirth
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Koln̈, Germany
| | - Klaus R Liedl
- Department of General, Inorganic and Theoretical Chemistry, Universität Innsbruck, Innrain 80/82, 6020 Innsbruck, Austria
| | - Sandra Brünken
- Radboud University, FELIX Laboratory, Institute for Molecules and Materials, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Stephan Schlemmer
- I. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Koln̈, Germany
| | - Pavol Jusko
- Max Planck Institute for Extraterrestrial Physics, Giessenbachstrasse 1, 85748 Garching, Germany
| |
Collapse
|
2
|
Vibrational Spectrum of ‘3-iodo-2-propynenitrile (IC3N)’ from accurate CCSD(T)-F12b/MP2-F12 potential energy surface. Theor Chem Acc 2022. [DOI: 10.1007/s00214-022-02923-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
3
|
Roy TK. Performance of Vibrational Self-Consistent Field Theory for Accurate Potential Energy Surfaces: Fundamentals, Excited States, and Intensities. J Phys Chem A 2022; 126:608-622. [PMID: 35050620 DOI: 10.1021/acs.jpca.1c09989] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The performance of vibrational structure calculations beyond harmonic approximation in the framework of the vibrational self-consistent field method with second-order perturbation corrections (VSCF-PT2) is investigated in conjunction with very accurate potential energy surfaces (PESs) given by various coupled-cluster electronic structure theories. The quality of anharmonic calculations depends on the accuracy of the underlying multidimensional PES obtained from its functional form, which is given by the level of electronic structure theory. Two such highest levels of typical coupled-cluster electronic structure methods, CCSD and the ″gold standard″ CCSD(T), along with their variants such as CCD, CR-CCL (completely renormalized CR-CC(2,3) approach), and CCSD(TQ) are tested for the construction of accurate anharmonic potentials without any fitting or ad hoc scaling and using cc-pVTZ basis sets. The accuracy of VSCF-PT2 theory in comparison to experimental values is tested for a series of 16 molecules with 135 fundamental bands, 64 overtones, and combination bands and also for 39 intensities. It is found that CCD and CCSD bind the potential tighter than CCSD(T) and the computed VSCF-PT2 transitions are more blue-shifted showing higher deviation from the experiment. In general, VSCF-PT2 results computed at the CCSD(T) potential offer a good cost/accuracy ratio, with the mean absolute deviation and the mean absolute percentage error with the experiment being ∼16 cm-1 and 1.38, respectively, for fundamentals. Additionally, while the CR-CCL and CCSD(TQ) methods offer similar levels of accuracies as compared to CCSD(T), the former offers a better accuracy/cost ratio than the latter and is a suitable alternative to CCSD(T).
Collapse
Affiliation(s)
- Tapta Kanchan Roy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), Samba, Jammu and Kashmir 181143, India
| |
Collapse
|
4
|
Barlow KR, Goodlett SM, Arradondo SN, Tschumper GS. Fundamental vibrational frequencies of isolated 2-phosphaethynolate and 2-phosphaethynthiolate anions: OCP – and SCP –. Mol Phys 2021. [DOI: 10.1080/00268976.2021.1967495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Kayleigh R. Barlow
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, USA
| | - Stephen M. Goodlett
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, USA
| | | | - Gregory S. Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS, USA
| |
Collapse
|
5
|
Qian W, Lu B, Tan G, Rauhut G, Grützmacher H, Zeng X. Vibrational spectrum and photochemistry of phosphaketene HPCO. Phys Chem Chem Phys 2021; 23:19237-19243. [PMID: 34524290 DOI: 10.1039/d1cp02860j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The vibrational spectra of the simplest phosphaketene HPCO and its isotopologue DPCO in solid Ar-matrices at 12.0 K have been analyzed with the aid of the computations at the CCSD(T)-F12a/cc-pVTZ-F12 level using configuration-selective vibrational configuration interaction (VCI). In addition to the four IR fundamentals, four overtone and ten combination bands have been unambiguously identified. Furthermore, the photochemistry of HPCO in the matrix has been investigated for the first time. Upon UV-light irradiation (365 or 266 nm), CO-elimination occurs by forming the parent phosphinidene HP that can be trapped by ˙NO to yield the elusive phosphinimine-N-oxyl radical HPNO˙. In contrast, an excimer laser (193 nm) irradiation of HPCO causes additional decomposition to H˙ and ˙PCO with concomitant formation of the long-sought phosphaethyne HOCP.
Collapse
Affiliation(s)
- Weiyu Qian
- Department of Chemistry, Fudan University, 200433 Shanghai, China.
| | - Bo Lu
- Department of Chemistry, Fudan University, 200433 Shanghai, China.
| | - Gengwen Tan
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 215123 Suzhou, China.
| | - Guntram Rauhut
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart 70569, Germany
| | | | - Xiaoqing Zeng
- Department of Chemistry, Fudan University, 200433 Shanghai, China.
| |
Collapse
|
6
|
Stoychev GL, Auer AA, Gauss J, Neese F. DLPNO-MP2 second derivatives for the computation of polarizabilities and NMR shieldings. J Chem Phys 2021; 154:164110. [PMID: 33940835 DOI: 10.1063/5.0047125] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a derivation and efficient implementation of the formally complete analytic second derivatives for the domain-based local pair natural orbital second order Møller-Plesset perturbation theory (MP2) method, applicable to electric or magnetic field-response properties but not yet to harmonic frequencies. We also discuss the occurrence and avoidance of numerical instability issues related to singular linear equation systems and near linear dependences in the projected atomic orbital domains. A series of benchmark calculations on medium-sized systems is performed to assess the effect of the local approximation on calculated nuclear magnetic resonance shieldings and the static dipole polarizabilities. Relative deviations from the resolution of the identity-based MP2 (RI-MP2) reference for both properties are below 0.5% with the default truncation thresholds. For large systems, our implementation achieves quadratic effective scaling, is more efficient than RI-MP2 starting at 280 correlated electrons, and is never more than 5-20 times slower than the equivalent Hartree-Fock property calculation. The largest calculation performed here was on the vancomycin molecule with 176 atoms, 542 correlated electrons, and 4700 basis functions and took 3.3 days on 12 central processing unit cores.
Collapse
Affiliation(s)
- Georgi L Stoychev
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Alexander A Auer
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Jürgen Gauss
- Department Chemie, Johannes Gutenberg-Universität Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| |
Collapse
|
7
|
Esch BVD, Peters LDM, Sauerland L, Ochsenfeld C. Quantitative Comparison of Experimental and Computed IR-Spectra Extracted from Ab Initio Molecular Dynamics. J Chem Theory Comput 2021; 17:985-995. [PMID: 33512155 DOI: 10.1021/acs.jctc.0c01279] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Experimentally measured infrared spectra are often compared to their computed equivalents. However, the accordance is typically characterized by visual inspection, which is prone to subjective judgment. The primary challenge for a similarity-based analysis is that the artifacts introduced by each approach are very different and, therefore, may require preprocessing steps to determine and correct impeding irregularities. To allow for automated objective assessment, we propose a practical and comprehensive workflow involving scaling factors, a novel baseline correction scheme, and peak smoothing. The resulting spectra can then easily be compared quantitatively using similarity measures, for which we found the Pearson correlation coefficient to be the most suitable. The proposed procedure is then applied to compare the agreement of the experimental infrared spectra from the NIST Chemistry Web book with the calculated spectra using standard harmonic frequency analysis and spectra extracted from ab initio molecular dynamics simulations at different levels of theory. We conclude that the direct, quantitative comparison of calculated and measured IR spectra might become a novel, sophisticated approach to benchmark quantum-chemical methods. In the present benchmark, simulated spectra based on ab initio molecular dynamics show in general better agreement with the experiment than static calculations.
Collapse
Affiliation(s)
- Beatriz von der Esch
- Chair of Theoretical Chemistry, Department of Chemistry, University of Munich (LMU), Butenandtstr. 7, D-81377 München, Germany
| | - Laurens D M Peters
- Chair of Theoretical Chemistry, Department of Chemistry, University of Munich (LMU), Butenandtstr. 7, D-81377 München, Germany
| | - Lena Sauerland
- Chair of Theoretical Chemistry, Department of Chemistry, University of Munich (LMU), Butenandtstr. 7, D-81377 München, Germany
| | - Christian Ochsenfeld
- Chair of Theoretical Chemistry, Department of Chemistry, University of Munich (LMU), Butenandtstr. 7, D-81377 München, Germany
| |
Collapse
|
8
|
Dargelos A, Pouchan C. CCSD(T)-F12 calculations of the IR spectrum of cyanoacetylene HC3N beyond the harmonic approximation. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137746] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
9
|
Auer AA, Tran VA, Sharma B, Stoychev GL, Marx D, Neese F. A case study of density functional theory and domain-based local pair natural orbital coupled cluster for vibrational effects on EPR hyperfine coupling constants: vibrational perturbation theory versus ab initio molecular dynamics. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1797916] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Van Anh Tran
- MPI für Kohlenforschung, Mülheim an der Ruhr, Germany
| | - Bikramjit Sharma
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Bochum, Germany
| | | | - Dominik Marx
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, Bochum, Germany
| | - Frank Neese
- MPI für Kohlenforschung, Mülheim an der Ruhr, Germany
| |
Collapse
|
10
|
|
11
|
Menezes da Silva VH, Ornellas FR. Characterizing structures, energetics, and spectra of species on the 1,3[H, C, As] potential energy surfaces: A high-level theoretical contribution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 226:117578. [PMID: 31670030 DOI: 10.1016/j.saa.2019.117578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/23/2019] [Accepted: 09/28/2019] [Indexed: 06/10/2023]
Abstract
The ground and the low lying electronic states of structures on the 1,3[H, C, As] potential energy surfaces were investigated with the highly correlated theoretical approaches CCSD(T), CCSD(T)-F12b, and CASSCF/MRCI along with the series of correlation consistent (aug-cc-pVnZ, n = D, T, Q, 5) basis sets. Energetic and spectroscopic parameters were obtained at the complete basis set limit, and the effect of core-valence correlation on these properties evaluated. Fundamental frequencies were also computed with the variational configuration interaction (VCI) approach. Heats of formation at 0 and 298.15 K were estimated for HCAs and CH, AsH, CAs, and HCAs, as well as the calculation of ionization potentials for HCAs. Comparisons of the present results with literature ones for the systems HCN/HNC, HCP/HPC highlight similarities and differences among these systems. Altogether, this investigation provides a very reliable characterization of the species on the surfaces and should guide future experimental studies on these systems.
Collapse
Affiliation(s)
- Vitor H Menezes da Silva
- Universidade de São Paulo, Instituto de Química, Departamento de Química Fundamental, Av. Lineu Prestes, 748, São Paulo, São Paulo, 05508-000, Brazil
| | - Fernando R Ornellas
- Universidade de São Paulo, Instituto de Química, Departamento de Química Fundamental, Av. Lineu Prestes, 748, São Paulo, São Paulo, 05508-000, Brazil.
| |
Collapse
|
12
|
Brehm M, Thomas M. Computing Bulk Phase Resonance Raman Spectra from ab Initio Molecular Dynamics and Real-Time TDDFT. J Chem Theory Comput 2019; 15:3901-3905. [PMID: 31246025 DOI: 10.1021/acs.jctc.9b00512] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We present our novel approach for computing resonance Raman (RR) spectra of periodic bulk phase systems from ab initio molecular dynamics, including solvent influence and some anharmonic effects. Based on real-time time-dependent density functional theory, we obtain the RR spectra for all laser wavelengths in one pass. We compute the RR spectrum of uracil in aqueous solution, which is in good agreement with experiment. This is the first simulation of a bulk phase RR spectrum.
Collapse
Affiliation(s)
- Martin Brehm
- Institut für Chemie - Theoretische Chemie , Martin-Luther-Universität Halle-Wittenberg , Von-Danckelmann-Platz 4 , 06120 Halle (Saale) , Germany
| | - Martin Thomas
- Institut für Chemie - Theoretische Chemie , Martin-Luther-Universität Halle-Wittenberg , Von-Danckelmann-Platz 4 , 06120 Halle (Saale) , Germany
| |
Collapse
|
13
|
Welch BK, Dawes R, Bross DH, Ruscic B. An Automated Thermochemistry Protocol Based on Explicitly Correlated Coupled-Cluster Theory: The Methyl and Ethyl Peroxy Families. J Phys Chem A 2019; 123:5673-5682. [DOI: 10.1021/acs.jpca.9b04381] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bradley K. Welch
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - Richard Dawes
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States
| | - David H. Bross
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Branko Ruscic
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
- Consortium for Advanced Science and Engineering, University of Chicago, Chicago, Illinois 60637, United States
| |
Collapse
|
14
|
Kuenzer U, Hofer TS. A four-dimensional Numerov approach and its application to the vibrational eigenstates of linear triatomic molecules – The interplay between anharmonicity and inter-mode coupling. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.01.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
15
|
Kuenzer U, Klotz M, Hofer TS. Probing vibrational coupling via a grid-based quantum approach-an efficient strategy for accurate calculations of localized normal modes in solid-state systems. J Comput Chem 2018; 39:2196-2209. [PMID: 30341952 PMCID: PMC6767160 DOI: 10.1002/jcc.25533] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/08/2018] [Accepted: 06/29/2018] [Indexed: 11/19/2022]
Abstract
In this work an approach to investigate the properties of strongly localized vibrational modes of functional groups in bulk material and on solid-state surfaces is presented. The associated normal mode vectors are approximated solely on the basis of structural information and obtained via diagonalization of a reduced Hessian. The grid-based Numerov procedure in one and two dimensions is then applied to an adequate scan of the respective potential surface yielding the associated vibrational wave functions and energy eigenvalues. This not only provides a detailed description of anharmonic effects but also an accurate inclusion of the coupling between the investigated vibrational states on a quantum mechanical level. All results obtained for the constructed normal modes are benchmarked against their analytical counterparts obtained from the diagonalization of the total Hessian of the entire system. Three increasingly complex systems treated at quantum chemical level of theory have been considered, namely the symmetric and asymmetric stretch vibrations of an isolated water molecule, hydroxyl groups bound to the surface of GeO2 (001), α-quartz(001) and Rutil (001) as well as crystalline Li2 NH serving as an example for a bulk material. While the data obtained for the individual systems verify the applicability of the proposed methodology, comparison to experimental data demonstrates the accuracy of this methodology despite the restriction to limit this methodology to a few selected vibrational modes. The possibility to investigate vibrational phenomena of localized normal modes without the requirement of executing costly harmonic frequency calculations of the entire system enables the application of this method to cases in which the determination of normal modes is prohibitively expensive or not available for a particular level of theory. © 2018 Wiley Periodicals, Inc.
Collapse
Affiliation(s)
- Ulrich Kuenzer
- University of Innsbruck, Institute of General, Inorganic and Theoretical Chemistry, Innrain 80‐826020 InnsbruckAustria
| | - Martin Klotz
- University of Innsbruck, Institute of General, Inorganic and Theoretical Chemistry, Innrain 80‐826020 InnsbruckAustria
| | - Thomas S. Hofer
- University of Innsbruck, Institute of General, Inorganic and Theoretical Chemistry, Innrain 80‐826020 InnsbruckAustria
| |
Collapse
|
16
|
Peters LDM, Kussmann J, Ochsenfeld C. Efficient and Accurate Born-Oppenheimer Molecular Dynamics for Large Molecular Systems. J Chem Theory Comput 2017; 13:5479-5485. [PMID: 29068678 DOI: 10.1021/acs.jctc.7b00937] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient scheme for the calculation of Born-Oppenheimer molecular dynamics (BOMD) simulations is introduced. It combines the corrected small basis set Hartree-Fock (HF-3c) method by Sure and Grimme [J. Comput. Chem. 2013, 43, 1672], extended Lagrangian BOMD (XL-BOMD) by Niklasson et al. [J. Chem. Phys. 2009, 130, 214109], and the calculation of the two electron integrals on graphics processing units (GPUs) [J. Chem. Phys. 2013, 138, 134114; J. Chem. Theory Comput. 2015, 11, 918]. To explore the parallel performance of our strong scaling implementation of the method, we present timings and extract, as its validation and first illustrative application, high-quality vibrational spectra from simulated trajectories of β-carotene, paclitaxel, and liquid water (up to 500 atoms). We conclude that the presented BOMD scheme may be used as a cost-efficient and reliable tool for computing vibrational spectra and thermodynamics of large molecular systems including explicit solvent molecules containing 500 atoms and more. Simulating 50 ps of maitotoxin (nearly 500 atoms) employing time steps of 0.5 fs requires ∼3 weeks on 12 CPUs (Intel Xeon E5 2620 v3) with 24 GPUs (AMD FirePro 3D W8100).
Collapse
Affiliation(s)
- Laurens D M Peters
- Chair of Theoretical Chemistry, Department of Chemistry, University of Munich (LMU) , Butenandtstr. 7, D-81377 München, Germany.,Center for Integrated Protein Science (CIPSM) at the Department of Chemistry, University of Munich (LMU) , Butenandtstr. 5-13, D-81377 München, Germany
| | - Jörg Kussmann
- Chair of Theoretical Chemistry, Department of Chemistry, University of Munich (LMU) , Butenandtstr. 7, D-81377 München, Germany.,Center for Integrated Protein Science (CIPSM) at the Department of Chemistry, University of Munich (LMU) , Butenandtstr. 5-13, D-81377 München, Germany
| | - Christian Ochsenfeld
- Chair of Theoretical Chemistry, Department of Chemistry, University of Munich (LMU) , Butenandtstr. 7, D-81377 München, Germany.,Center for Integrated Protein Science (CIPSM) at the Department of Chemistry, University of Munich (LMU) , Butenandtstr. 5-13, D-81377 München, Germany
| |
Collapse
|
17
|
Belinassi AR, Ornellas FR. A theoretical exploration of new species on the 1[H, Se, I] potential energy surface: Energetics, structures, IR spectra, and heats of formation. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.06.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
18
|
Khomyakov DG, Timerghazin QK. Toward reliable modeling of S-nitrosothiol chemistry: Structure and properties of methyl thionitrite (CH3SNO), an S-nitrosocysteine model. J Chem Phys 2017; 147:044305. [DOI: 10.1063/1.4995300] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Dmitry G. Khomyakov
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, USA
| | - Qadir K. Timerghazin
- Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, USA
| |
Collapse
|
19
|
Brehm M, Thomas M. Computing Bulk Phase Raman Optical Activity Spectra from ab initio Molecular Dynamics Simulations. J Phys Chem Lett 2017; 8:3409-3414. [PMID: 28685571 DOI: 10.1021/acs.jpclett.7b01616] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present our novel methodology for computing Raman optical activity (ROA) spectra of liquid systems from ab initio molecular dynamics (AIMD) simulations. The method is built upon the recent developments to obtain magnetic dipole moments from AIMD and to integrate molecular properties by using radical Voronoi tessellation. These techniques are used to calculate optical activity tensors for large and complex periodic bulk phase systems. Only AIMD simulations are required as input, and no time-consuming perturbation theory is involved. The approach relies only on the total electron density in each time step and can readily be combined with a wide range of electronic structure methods. To the best of our knowledge, these are the first computed ROA spectra for a periodic bulk phase system. As an example, the experimental ROA spectrum of liquid (R)-propylene oxide is reproduced very well.
Collapse
Affiliation(s)
- Martin Brehm
- Institut für Chemie - Theoretische Chemie, Martin-Luther-Universität Halle-Wittenberg , Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| | - Martin Thomas
- Institut für Chemie - Theoretische Chemie, Martin-Luther-Universität Halle-Wittenberg , Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
| |
Collapse
|
20
|
Gronowski M, Eluszkiewicz P, Custer T. Structure and Spectroscopy of C2HNO Isomers. J Phys Chem A 2017; 121:3263-3273. [DOI: 10.1021/acs.jpca.6b12609] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcin Gronowski
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Piotr Eluszkiewicz
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Thomas Custer
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| |
Collapse
|
21
|
Partanen L, Hänninen V, Halonen L. Effects of Global and Local Anharmonicities on the Thermodynamic Properties of Sulfuric Acid Monohydrate. J Chem Theory Comput 2016; 12:5511-5524. [PMID: 27662456 DOI: 10.1021/acs.jctc.6b00683] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We use state-of-the-art electronic structure calculation methods and large basis sets to obtain reliable values for the thermodynamic properties of sulfuric acid monohydrate and study the effects of vibrational anharmonicity on these properties. We distinguish between two forms of vibrational anharmonicity: local anharmonicity, which refers to the anharmonicity of the vibrational modes of a given cluster conformer, and global anharmonicity, which originates from accounting for the presence of different conformers in the first place. In our most accurate approach, we solve the nuclear Schrödinger equation variationally for the intermolecular large-amplitude motions, thus quantum-mechanically accounting for the presence of higher-energy conformers for both reactants and products, while using the standard vibrational perturbational approach for the other vibrational modes. This results in a value of -11.0 kJ/mol for the reaction Gibbs free energy at 298.15 K. When standard vibrational perturbational approaches are employed, the effects of local anharmonicity depend heavily on the choice of the electronic structure calculation basis set. In fact, better results can often be achieved by combining a simple harmonic treatment for the vibrational partition function with a statistical mechanical accounting of global anharmonicity. Thus, we recommend that future studies that intend to include anharmonicity start by accounting for the presence of higher-energy conformers and only then consider whether local anharmonicity calculations are feasible and necessary.
Collapse
Affiliation(s)
- Lauri Partanen
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki , P.O. Box 55, A.I. Virtasen aukio 1, FIN-00014 Helsinki, Finland
| | - Vesa Hänninen
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki , P.O. Box 55, A.I. Virtasen aukio 1, FIN-00014 Helsinki, Finland
| | - Lauri Halonen
- Laboratory of Physical Chemistry, Department of Chemistry, University of Helsinki , P.O. Box 55, A.I. Virtasen aukio 1, FIN-00014 Helsinki, Finland
| |
Collapse
|
22
|
Kowalewski M, Larsson E, Heryudono A. An adaptive interpolation scheme for molecular potential energy surfaces. J Chem Phys 2016; 145:084104. [DOI: 10.1063/1.4961148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Markus Kowalewski
- Department of Information Technology, Uppsala University, Box 337, SE-751 05 Uppsala, Sweden
| | - Elisabeth Larsson
- Department of Information Technology, Uppsala University, Box 337, SE-751 05 Uppsala, Sweden
| | - Alfa Heryudono
- Department of Mathematics, University of Massachusetts Dartmouth, Dartmouth, Massachusetts 02747, USA
| |
Collapse
|
23
|
Mancera LA, Benoit DM. Vibrational anharmonicity of small gold and silver clusters using the VSCF method. Phys Chem Chem Phys 2016; 18:529-49. [DOI: 10.1039/c5cp05283a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We study the vibrational spectra of small neutral gold (Au2–Au10) and silver (Ag2–Au5) clusters using the vibrational self-consistent field method (VSCF) in order to account for anharmonicity.
Collapse
Affiliation(s)
- Luis A. Mancera
- Institute of Theoretical Chemistry
- University of Ulm
- D-89069 Ulm
- Germany
| | | |
Collapse
|
24
|
Petrenko T, Rauhut G. Time-independent eigenstate-free calculation of vibronic spectra beyond the harmonic approximation. J Chem Phys 2015; 143:234106. [DOI: 10.1063/1.4937380] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- Taras Petrenko
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Guntram Rauhut
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| |
Collapse
|
25
|
Meier P, Rauhut G. Comparison of methods for calculating Franck–Condon factors beyond the harmonic approximation: how important are Duschinsky rotations? Mol Phys 2015. [DOI: 10.1080/00268976.2015.1074740] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
26
|
Oschetzki D, Rauhut G. Pushing the limits in accurate vibrational structure calculations: anharmonic frequencies of lithium fluoride clusters (LiF)n, n = 2-10. Phys Chem Chem Phys 2015; 16:16426-35. [PMID: 24981078 DOI: 10.1039/c4cp02264e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The vibrational spectra of a series of small lithium fluoride clusters, i.e. (LiF)n, n = 2-10, were studied by vibrational configuration interaction (VCI) calculations relying on potential energy surfaces including three-mode coupling terms and being obtained from explicitly correlated local coupled cluster calculations. Due to the account for anharmonicity effects, the simulated spectra allow for a direct comparison with experimental data and may thus help to identify clusters in the experiments. Even structurally closely related clusters can clearly be distinguished by infrared spectroscopy. The largest system in this study required more than 1000 basis functions in the electronic structure calculations and more than 10(7) configurations in the vibrational structure calculations and became computationally feasible only due to a combination of different approximations and highly parallelized algorithms.
Collapse
Affiliation(s)
- Dominik Oschetzki
- Institute of Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany.
| | | |
Collapse
|
27
|
Ramakrishnan R, Rauhut G. Semi-quartic force fields retrieved from multi-mode expansions: Accuracy, scaling behavior, and approximations. J Chem Phys 2015; 142:154118. [DOI: 10.1063/1.4918587] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Raghunathan Ramakrishnan
- Institute of Physical Chemistry and National Center for Computational Design and Discovery of Novel Materials (MARVEL), Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland
| | - Guntram Rauhut
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| |
Collapse
|
28
|
Heger M, Otto KE, Mata RA, Suhm MA. Bracketing subtle conformational energy differences between self-solvated and stretched trifluoropropanol. Phys Chem Chem Phys 2015; 17:9899-909. [DOI: 10.1039/c4cp05868b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interconversion landscape between stretched and folded trifluoropropanol conformations is characterized by Raman jet spectroscopy and theory.
Collapse
Affiliation(s)
- Matthias Heger
- Institut für Physikalische Chemie
- Universität Göttingen
- 37077 Göttingen
- Germany
| | - Katharina E. Otto
- Institut für Physikalische Chemie
- Universität Göttingen
- 37077 Göttingen
- Germany
| | - Ricardo A. Mata
- Institut für Physikalische Chemie
- Universität Göttingen
- 37077 Göttingen
- Germany
| | - Martin A. Suhm
- Institut für Physikalische Chemie
- Universität Göttingen
- 37077 Göttingen
- Germany
| |
Collapse
|
29
|
Costard R, Tyborski T, Fingerhut BP. Anharmonicities and coherent vibrational dynamics of phosphate ions in bulk H2O. Phys Chem Chem Phys 2015; 17:29906-17. [DOI: 10.1039/c5cp04502a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2D IR spectroscopy reveals Fermi resonances and long lived quantum beats for phosphate ions in water.
Collapse
Affiliation(s)
- Rene Costard
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
- D-12489 Berlin
- Germany
| | - Tobias Tyborski
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
- D-12489 Berlin
- Germany
| | - Benjamin P. Fingerhut
- Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie
- D-12489 Berlin
- Germany
| |
Collapse
|
30
|
Banerjee D, Ghosh A, Chattopadhyay S, Ghosh P, Chaudhuri RK. Revisiting the ‘cis-effect’ in 1,2-difluoro derivatives of ethylene and diazene usingab initiomultireference methods. Mol Phys 2014. [DOI: 10.1080/00268976.2014.938710] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
31
|
Theoretical prediction of structural, vibrational and NMR parameters of plastic optical fiber (POF) material precursors. Cis and trans perhydro- and perfluoro-2-methylene-4,5-dimethyl-1,3-dioxolanes. J Mol Graph Model 2014; 52:36-45. [DOI: 10.1016/j.jmgm.2014.06.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 05/14/2014] [Accepted: 06/17/2014] [Indexed: 11/18/2022]
|
32
|
Meier P, Oschetzki D, Berger R, Rauhut G. Transformation of potential energy surfaces for estimating isotopic shifts in anharmonic vibrational frequency calculations. J Chem Phys 2014; 140:184111. [DOI: 10.1063/1.4874849] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
|
33
|
Nozirov F, Kupka T, Stachów M. Theoretical prediction of nuclear magnetic shieldings and indirect spin-spin coupling constants in 1,1-, cis-, and trans-1,2-difluoroethylenes. J Chem Phys 2014; 140:144303. [DOI: 10.1063/1.4870396] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
34
|
Mateo D, Eloranta J. Solvation of Intrinsic Positive Charge in Superfluid Helium. J Phys Chem A 2014; 118:6407-15. [DOI: 10.1021/jp501451y] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David Mateo
- Department
of Chemistry and Biochemistry, California State University at Northridge, 18111 Nordhoff Street, Northridge, California 91330, United States
| | - Jussi Eloranta
- Department
of Chemistry and Biochemistry, California State University at Northridge, 18111 Nordhoff Street, Northridge, California 91330, United States
| |
Collapse
|
35
|
Strobusch D, Scheurer C. Adaptive sparse grid expansions of the vibrational Hamiltonian. J Chem Phys 2014; 140:074111. [DOI: 10.1063/1.4864356] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
36
|
|
37
|
Partanen L, Pesonen J, Sjöholm E, Halonen L. A rotamer energy level study of sulfuric acid. J Chem Phys 2013; 139:144311. [DOI: 10.1063/1.4823836] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
|
38
|
Pesonen J. Constrained molecular vibration-rotation Hamiltonians: contravariant metric tensor. J Chem Phys 2013; 139:144310. [PMID: 24116622 DOI: 10.1063/1.4823835] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Here, I present a practical recipe for obtaining contravariant vibration-rotation metric tensors, and thus the kinetic energy operators, when some degrees of freedom are constrained rigidly. An element of the contravariant metric tensor is obtained as a sum of dot products of contravariant measuring vectors, which are obtained from their unconstrained counterparts by adding a frozen mode correction. The present method applies in principle for any choice of shape coordinates and a body-frame for which the contravariant measuring vectors can be evaluated. In contrast to the existing methods, the present method does not involve evaluation of covariant metric tensors, matrix inversions, chain rules of derivation, or numerical differentiation. It is applied in the sequel paper [L. Partanen, J. Pesonen, E. Sjöholm, and L. Halonen, J. Chem. Phys. 139, 144311 (2013)] to study the effects of several different approximations to the kinetic energy operator, when the two large-amplitude OH-torsional motions in H2SO4 are of interest.
Collapse
Affiliation(s)
- Janne Pesonen
- Department of Chemistry, University of Helsinki, P.O. Box 55 (A. I. Virtasen aukio 1), Helsinki FIN-00014, Finland
| |
Collapse
|
39
|
Horný Ľ, Schaefer HF, Ünlü F, Willeke M. Theoretical investigation of the cyclopropene radical cation c-C 3H +• 4: structure, energetics and spectroscopic properties †. Mol Phys 2013. [DOI: 10.1080/00268976.2013.806684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Ľuboš Horný
- Laboratory of Physical Chemistry, , ETH Zürich, Zürich, 8093, Switzerland
| | - Henry F. Schaefer
- Center for Computational Quantum Chemistry, University of Georgia , Athens, Georgia, 30602-2525, USA
| | - Fatih Ünlü
- Laboratory of Physical Chemistry, , ETH Zürich, Zürich, 8093, Switzerland
| | - Martin Willeke
- Department of Materials, , ETH Zürich, Zürich, 8093, Switzerland
| |
Collapse
|
40
|
Müller-Werkmeister HM, Li YL, Lerch EBW, Bigourd D, Bredenbeck J. Ultrafast Hopping from Band to Band: Assigning Infrared Spectra based on Vibrational Energy Transfer. Angew Chem Int Ed Engl 2013; 52:6214-7. [DOI: 10.1002/anie.201209916] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Revised: 02/18/2013] [Indexed: 11/05/2022]
|
41
|
Müller-Werkmeister HM, Li YL, Lerch EBW, Bigourd D, Bredenbeck J. Ultrafast Hopping from Band to Band: Assigning Infrared Spectra based on Vibrational Energy Transfer. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209916] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
42
|
Thomas M, Brehm M, Fligg R, Vöhringer P, Kirchner B. Computing vibrational spectra from ab initio molecular dynamics. Phys Chem Chem Phys 2013; 15:6608-22. [DOI: 10.1039/c3cp44302g] [Citation(s) in RCA: 319] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
43
|
Rutkowska-Zbik D, Korona T. How Many Ligands Can Be Bound by Magnesium–Porphyrin? A Symmetry-Adapted Perturbation Theory Study. J Chem Theory Comput 2012; 8:2972-82. [DOI: 10.1021/ct300281p] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dorota Rutkowska-Zbik
- Jerzy Haber Institute of Catalysis and Surface
Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239
Cracow, Poland
| | - Tatiana Korona
- Faculty
of Chemistry, University of Warsaw, ul. Pasteura 1, 02-093 Warsaw,
Poland
| |
Collapse
|
44
|
Laury ML, Carlson MJ, Wilson AK. Vibrational frequency scale factors for density functional theory and the polarization consistent basis sets. J Comput Chem 2012; 33:2380-7. [DOI: 10.1002/jcc.23073] [Citation(s) in RCA: 155] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2012] [Revised: 06/19/2012] [Accepted: 06/25/2012] [Indexed: 11/09/2022]
|
45
|
Banert K, Berndt C, Hagedorn M, Liu H, Anacker T, Friedrich J, Rauhut G. Experimentelle und theoretische Untersuchungen der Synthesen, spektroskopischen Daten und Reaktionen des Formylazids. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
46
|
Banert K, Berndt C, Hagedorn M, Liu H, Anacker T, Friedrich J, Rauhut G. Experimental and Theoretical Studies on the Synthesis, Spectroscopic Data, and Reactions of Formyl Azide. Angew Chem Int Ed Engl 2012; 51:4718-21. [DOI: 10.1002/anie.201200029] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Indexed: 11/11/2022]
|
47
|
Domin D, Benoit DM. Assessing Spin-Component-Scaled Second-Order Møller-Plesset Theory Using Anharmonic Frequencies. Chemphyschem 2011; 12:3383-91. [DOI: 10.1002/cphc.201100499] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Indexed: 11/08/2022]
|
48
|
Strobusch D, Scheurer C. The hierarchical expansion of the kinetic energy operator in curvilinear coordinates extended to the vibrational configuration interaction method. J Chem Phys 2011; 135:144101. [DOI: 10.1063/1.3646514] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
|
49
|
Strobusch D, Scheurer C. Hierarchical expansion of the kinetic energy operator in curvilinear coordinates for the vibrational self-consistent field method. J Chem Phys 2011; 135:124102. [DOI: 10.1063/1.3637629] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
50
|
Pfeiffer F, Rauhut G. Anharmonic Frequencies of CX2Y2 (X, Y = O, N, F, H, D) Isomers and Related Systems Obtained from Vibrational Multiconfiguration Self-Consistent Field Theory. J Phys Chem A 2011; 115:11050-6. [DOI: 10.1021/jp2064062] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Florian Pfeiffer
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Guntram Rauhut
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| |
Collapse
|