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Zapata Trujillo JC, McKemmish LK. VIBFREQ1295: A New Database for Vibrational Frequency Calculations. J Phys Chem A 2022; 126:4100-4122. [PMID: 35723975 DOI: 10.1021/acs.jpca.2c01438] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
High-throughput approaches for producing approximate vibrational spectral data for molecules of astrochemistry interest rely on harmonic frequency calculations using computational quantum chemistry. However, model chemistry recommendations (i.e., a level of theory and basis set pair) for these calculations are not yet available and, thus, thorough benchmarking against comprehensive benchmark databases is needed. Here, we present a new database for vibrational frequency calculations (VIBFREQ1295) storing 1295 experimental fundamental frequencies and CCSD(T)(F12*)/cc-pVDZ-F12 ab initio harmonic frequencies from 141 molecules. VIBFREQ1295's experimental data was complied through a comprehensive review of contemporary experimental data, while the ab initio data was computed here. The chemical space spanned by the molecules chosen is considered in-depth and is shown to have good representation of common organic functional groups and vibrational modes. Scaling factors are routinely used to approximate the effect of anharmonicity and convert computed harmonic frequencies to predicted fundamental frequencies. With our experimental and high-level ab initio data, we find that a single global uniform scaling factor of 0.9617(3) results in median differences of 15.9(5) cm-1. A far superior performance with a median difference of 7.5(5) cm-1 can be obtained, however, by using separate scaling factors (SFs) for three regions: frequencies less than 1000 cm-1 (SF = 0.987(1)), between 1000 and 2000 cm-1 (SF = 0.9727(6)), and above 2000 cm-1 (SF = 0.9564(4)). This sets a lower bound for the performance that could be reliably obtained using scaling of harmonic frequency calculations to predict experimental fundamental frequencies. VIBFREQ1295's most important purpose is to provide a robust database for benchmarking the performance of any vibrational frequency calculations. VIBFREQ1295 data could also be used to train machine-learning models for the prediction of vibrational spectra and as a reference and data starting point for more detailed spectroscopic modeling of particular molecules. The database can be found as part of the Supporting Information for this paper or in the Harvard DataVerse at https://doi.org/10.7910/DVN/VLVNU7.
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Affiliation(s)
| | - Laura K McKemmish
- School of Chemistry, University of New South Wales, 2052 Sydney, Australia
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2
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Carvalho JR, Vidal LN. Calculation of absolute Raman scattering cross-sections using vibrational self-consistent field/vibrational configuration interaction wave functions. J Comput Chem 2022; 43:1484-1494. [PMID: 35731622 DOI: 10.1002/jcc.26951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 05/21/2022] [Accepted: 06/02/2022] [Indexed: 11/12/2022]
Abstract
In the present study, the differential scattering cross-sections, depolarization ratios and Raman shifts of small molecular systems are obtained from configuration iteration wave functions of vibrational self-consistent field (VSCF) states. The transition polarizabilities were modeled using the Placzek approximation, neglecting those contributions not arising from the electric dipole mechanism. This theoretical approach is considered a good approximation for samples that absorb in the UV range if the excitation radiation falls in the visible region, as is the case of the molecules selected for the present study, namely: water, methane, and acetylene. Potential energy and electronic polarizability surfaces are calculated by the CCSD(T) and CC3 methods with aug-cc-p(C)V(T,Q,5)Z basis sets. The vibrational Hamiltonian includes the vibrational angular momentum contribution of the Watson kinetic energy operator. As expected, due to the variational nature of the VSCF and vibrational configuration interaction (VCI) methods, the Raman transition wavenumbers are substantially improved over the harmonic predictions. Surprisingly, the scattering cross-sections obtained using the harmonic approximation or the VSCF method better agrees with the experimental values than those cross-sections predicted using VCI wave functions. The more significant deviations of the VCI results from the experimental reference may be related to the significant uncertainties of the measured cross-sections. Still, it may also indicate that the VCI Raman transition moments may require a more accurate description of the electronic polarizability surface. Finally, the depolarization ratios calculated for H2 O and C2 D2 using harmonic and VCI wave functions have similar accuracy, whereas, for C2 H2 and C2 HD, the VCI results are more accurate.
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Affiliation(s)
- Jhonatas R Carvalho
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, USA
| | - Luciano N Vidal
- Departamento Acadêmico de Química e Biologia, Universidade Tecnológica Federal do Paraná, Curitiba, Paraná, Brazil
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3
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Chang X, Dobrolyubov EO, Krasnoshchekov SV. Fundamental studies of vibrational resonance phenomena by multivalued resummation of the divergent Rayleigh-Schrödinger perturbation theory series: deciphering polyad structures of three H 216O isotopologues. Phys Chem Chem Phys 2022; 24:6655-6675. [PMID: 35234755 DOI: 10.1039/d1cp04279c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A fundamental quantitative study of the vibrational resonances of three H216O H,D-isotopologues with a quartic Watson Hamiltonian was carried out using the resummation of the high-order (∼λn, n ≤ 203) divergent Rayleigh-Schrödinger perturbation theory (RSPT) series by quartic Padé-Hermite multivalued diagonal approximants PH[m,m,m,m,m], m ≤ 40. The resonance condition between a pair of states is formulated as the existence of a common complex energy solution branch point inside the unit circle: |E(λj)|, Re(λj)2 + Im(λj)2 ≤ 1. For the matrix formulation of the vibrational problem (VCI), the existence of common branch points is governed by the Katz theorem and they can be found as roots of discriminant polynomials. The main branches of the Padé-Hermite approximants typically reproduce VCI energies with high accuracy while alternative branches often fit nearby resonant states. The resummation of the RSPT series for H2O and D2O (up to the tenth polyad) revealed not only Fermi and Darling-Dennison resonances, but also unusual (0,2,-5) and (5,-2,0) resonance effects matching the (5,2,5) polyad structure, while the (3,2,1) structure was rigorously confirmed for HDO. It is demonstrated that the (5,2,5) polyad structure ensures good organization of high-energy resonating states and breaks down the classic (2,1,2) structure. The advocated methodology of quantitative description of resonance phenomena and revealing polyad structures is suitable for larger molecules and can be adapted to linear molecules and symmetric tops. Its application ensures rigorous classification of vibrational states and can be used in quantitative vibration-rotation spectroscopy.
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Affiliation(s)
- Xuanhao Chang
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow, 119899, Russian Federation.
| | - Egor O Dobrolyubov
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow, 119899, Russian Federation.
| | - Sergey V Krasnoshchekov
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow, 119899, Russian Federation.
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4
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Kupka T, Gajda T, Ochędzan-Siodłak W, Buczek A, Broda MA. On the impact of side methyl groups on the structure and vibrational properties of β-carotenoids. The case of butadiene and isoprene. Food Chem 2022; 369:130880. [PMID: 34438344 DOI: 10.1016/j.foodchem.2021.130880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 08/02/2021] [Accepted: 08/14/2021] [Indexed: 11/04/2022]
Abstract
Theoretical consideration about the impact of methyl groups on the structure and vibrational properties of β-carotenoids, using medium size molecules of trans-butadiene and trans-isoprene, are reported. Density functional theory (DFT) calculations with correlation-consistent and polarization-consistent basis sets were applied to trans-1,3-butadiene and trans-isoprene as the smallest building bricks of β-carotenoids. Their structure and harmonic vibrations were estimated in the complete basis set limit (CBS) using the non-linear least square fit. Optimized geometries and harmonic frequencies, obtained with B3LYP and BLYP density functionals and large basis sets, were favorably reproduced by a significantly faster approach, using a recently modified STO(1M)-3G Slater-type basis set. Selected density functionals with STO(1M)-3G and 6-311++G** basis sets were also successful in predicting β-carotene structures and harmonic vibrations. This work demonstrates the potential applicability of the proposed level of theory for larger molecules, including β-carotenoids, present in numerous natural food sources. The proposed scheme of molecular modeling, applied to biologically active compounds in food, could provide a deeper insight into their function in vivo, which is directly related to their structure and spectroscopic properties. It could also support the experimental qualitative analysis, based on peak assignment of β-carotenoids in various food sources.
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Affiliation(s)
- Teobald Kupka
- University of Opole, Faculty of Chemistry, 48, Oleska Street, 45-052 Opole, Poland.
| | - Tomasz Gajda
- University of Opole, Faculty of Chemistry, 48, Oleska Street, 45-052 Opole, Poland
| | | | - Aneta Buczek
- University of Opole, Faculty of Chemistry, 48, Oleska Street, 45-052 Opole, Poland
| | - Małgorzata A Broda
- University of Opole, Faculty of Chemistry, 48, Oleska Street, 45-052 Opole, Poland
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5
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Krasnoshchekov SV, Laptev VB, Klimin SA, Gainullin IK, Makarov AA. Overtone spectroscopy of v(C=O) stretching vibration of hexafluoroacetone: Experimental and ab initio determination of peak positions, absolute intensities, and band shapes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 238:118396. [PMID: 32408225 DOI: 10.1016/j.saa.2020.118396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 04/08/2020] [Accepted: 04/19/2020] [Indexed: 06/11/2023]
Abstract
Infrared overtone spectra of the ν(C = O) stretching vibration (ν1) of gaseous hexafluoroacetone ((CF3)2C = O, HFA) were recorded in the spectral range of 7450-3300 cm-1 with a resolution of 0.1 cm-1. Experimental absolute IR intensities and vibrational band centers of the overtones 2ν1, 3ν1, 4ν1 of HFA were measured and compared with their ab initio counterparts, calculated by the second-order canonical vibrational perturbation theory (CVPT2). A hybrid potential energy surface (PES) was evaluated using the quantum-mechanical models MP2/cc-pVQZ for harmonic and MP2/cc-pVTZ for anharmonic parts. Cubic surfaces of dipole moment components were determined using the MP2/cc-pVTZ model. The predicted IR intensities for the first and second overtones reproduced the experimental values with a discrepancy of 6% and 9%, respectively. A weak Fermi resonance between the first overtone 2ν1 and combination tone ν1 + ν2 + ν8 was predicted. The appropriate model was employed for simulating the bands studied using: (i) the asymmetric-top vibration-rotational structure of the ν1 mode, (ii) the inhomogeneous band structure due to contributions of the vibrational states populated at the room temperature, and (iii) the homogeneous broadening of each vibration-rotation transition due to the intramolecular vibrational redistribution (IVR). The rotational and vibrational anharmonic constants were taken from the ab initio calculations, whereas the IVR data were obtained from the experimental data of Chekalin et al. (JPCA 2014, 118:955) with a time resolution of ≈100 fs. A good level of agreement of the predicted shapes of bands studied with experiment is achieved.
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Affiliation(s)
- Sergey V Krasnoshchekov
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow 119991, Russian Federation.
| | - Vladimir B Laptev
- Institute of Spectroscopy, Russian Academy of Sciences, Fizicheskaya 5, Troitsk, Moscow 108840, Russian Federation
| | - Sergey A Klimin
- Institute of Spectroscopy, Russian Academy of Sciences, Fizicheskaya 5, Troitsk, Moscow 108840, Russian Federation
| | - Ivan K Gainullin
- Department of Physics, Lomonosov Moscow State University, Leninskiye Gory 1-2, 119991 Moscow, Russian Federation
| | - Alexander A Makarov
- Institute of Spectroscopy, Russian Academy of Sciences, Fizicheskaya 5, Troitsk, Moscow 108840, Russian Federation; Moscow Institute of Physics and Technology, Institutsky lane 9, Dolgoprudny, Moscow Region 141700, Russian Federation; National Research University, Higher School of Economics, Myasnitskaya 20, Moscow 101000, Russian Federation
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Furuya K, Sakamoto A, Tasumi M. Anharmonic Vibrational Analysis of Ethylene, Butadiene, and Longer Conjugated Alkenes by Double-Hybrid Density-Functional Theory Calculations. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20200032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kazuhiko Furuya
- HPC SYSTEMS Inc., 8F LOOP-X, 3-9-15 Kaigan, Minato-ku, Tokyo 108-0022, Japan
| | - Akira Sakamoto
- College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan
| | - Mitsuo Tasumi
- Sapiarc Research Laboratory, 5-14-19-101 Roppongi, Minato-ku, Tokyo 106-0032, Japan
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Martin-Drumel MA, Porterfield JP, Goubet M, Asselin P, Georges R, Soulard P, Nava M, Changala PB, Billinghurst B, Pirali O, McCarthy MC, Baraban JH. Synchrotron-Based High Resolution Far-Infrared Spectroscopy of trans-Butadiene. J Phys Chem A 2020; 124:2427-2435. [DOI: 10.1021/acs.jpca.0c00623] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Jessica P. Porterfield
- Center for Astrophysics, Harvard & Smithsonian, Cambridge, Massachusetts 02138, United States
| | - Manuel Goubet
- Université Lille, CNRS, UMR 8523-PhLAM-Physique des Lasers, Atomes et Molécules, F-59000 Lille, France
| | - Pierre Asselin
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8233, MONARIS, F-75005 Paris, France & CNRS, UMR 8233, MONARIS, F-75005 Paris, France
| | - Robert Georges
- Institut de Physique de Rennes, CNRS, UMR 6251, Université de Rennes 1, F-35042 Rennes, France
| | - Pascale Soulard
- Sorbonne Universités, UPMC Univ Paris 06, UMR 8233, MONARIS, F-75005 Paris, France & CNRS, UMR 8233, MONARIS, F-75005 Paris, France
| | - Matthew Nava
- Department of Chemistry, Harvard University, Cambridge, Massachusetts 02138, United States
| | - P. Bryan Changala
- JILA, University of Colorado, Boulder, Colorado 80309, United States
| | - Brant Billinghurst
- Canadian Light Source, University of Saskatchewan, Saskatoon, Saskatchewan S7N 2V3, Canada
| | - Olivier Pirali
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France
| | - Michael C. McCarthy
- Center for Astrophysics, Harvard & Smithsonian, Cambridge, Massachusetts 02138, United States
| | - Joshua H. Baraban
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
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Mohamed TA, Shaaban IA, Soliman UA, Zoghaib WM. Computational studies, NMR, Raman and infrared spectral analysis of centrosymmetric (2Z,4Z)-Hexa-2,4-dienedinitrile. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2019. [DOI: 10.1142/s0219633619500111] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The Raman (50–3500[Formula: see text]cm[Formula: see text]) and infrared (200–3500[Formula: see text]cm[Formula: see text]) spectra of (2Z,4Z)-Hexa-2,4-dienedinitrile (C6H4N2; cis,cis-HDDN) have been recorded. Initially, three conformers were proposed based on following point groups: C2h, C2v and [Formula: see text] (gauche). For comparison purposes, M05-2X, M06-2X method were used in addition to B3LYP, MP2[Formula: see text]full and MP4[Formula: see text]full quantum mechanical calculations employing 6-31G(d) and 6-311+G(d,p) basis sets using Gaussian 09 program. Aided by potential energy surface scan, the C2h conformer is verified as a global minimum and the gauche ([Formula: see text]) being a local minimum with an energy barrier of 2.82[Formula: see text]kcal/mol. The energy difference ranged from 4.87 to 13.70[Formula: see text]kcal/mol favors the C2h conformer in good agreement with Raman and infrared spectral analysis. These results were also supported by the observed [Formula: see text] value (H9-H[Formula: see text]) at 10.8[Formula: see text]Hz which is consistent to 10.19[Formula: see text]Hz estimated for centrosymmetric conformer (C2h) rather than 4.81[Formula: see text]Hz predicted for gauche ([Formula: see text]). Complete vibrational assignments are proposed herein based on normal coordinate analysis (NCA) and potential energy distributions (PEDs) combined with theoretical vibrational frequencies and force constants in internal coordinates. It is crucial that NCA using VEDA 4 program with mixing shows large deviations from ours due to neglecting symmetry elements while mixing molecular vibrational motions. The results of these spectroscopic and theoretical studies are reported herein and compared with similar molecules whenever appropriate.
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Affiliation(s)
- Tarek A. Mohamed
- Department of Chemistry, Faculty of Science (Men’s Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt
| | - Ibrahim A. Shaaban
- Department of Chemistry, Faculty of Science (Men’s Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt
- Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, Abha 61321, Saudi Arabia
| | - Usama A. Soliman
- Department of Chemistry, Faculty of Science (Men’s Campus), Al-Azhar University, Nasr City 11884, Cairo, Egypt
- Department of Chemistry, Faculty of Science, Jazan University, Jazan 82621, Saudi Arabia
| | - Wajdi M. Zoghaib
- Department of Chemistry, Faculty of Science, Sultan Qaboos University, P.O. Box 36, Al Khod, Muscat, Sultanate of Oman
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9
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Martin-Drumel MA, Baraban JH, Changala PB, Stanton JF, McCarthy MC. The Hunt for Elusive Molecules: Insights from Joint Theoretical and Experimental Investigations. Chemistry 2019; 25:7243-7258. [PMID: 30673130 DOI: 10.1002/chem.201805986] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Indexed: 11/10/2022]
Abstract
Rotational spectroscopy is an invaluable tool to unambiguously determine the molecular structure of a species, and sometimes even to establish its very existence. This article illustrates how experimental and theoretical state-of-the-art tools can be used in tandem to investigate the rotational structure of molecules, with particular emphasis on those that have long remained elusive. The examples of three emblematic species-gauche-butadiene, disilicon carbide, and germanium dicarbide-highlight the close, mutually beneficial interaction between high-level theoretical calculations and sensitive microwave measurements. Prospects to detect other elusive molecules of chemical and astronomical interest are discussed.
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Affiliation(s)
- Marie-Aline Martin-Drumel
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Univ. Paris-Sud, Université Paris-Saclay, F-91405, Orsay, France
| | - Joshua H Baraban
- Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
| | - P Bryan Changala
- JILA, National Institute of Standards and Technology and Department of, Physics, University of Colorado, Boulder, CO, 80309, USA
| | - John F Stanton
- Quantum Theory Project, Departments of Chemistry and Physics, Univ. of Florida, Gainesville, FL, 32611, USA
| | - Michael C McCarthy
- Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts, 02138, USA
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10
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Pietropolli Charmet A, Cornaton Y. Benchmarking fully analytic DFT force fields for vibrational spectroscopy: A study on halogenated compounds. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.01.089] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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11
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Krasnoshchekov SV, Schutski RS, Craig NC, Sibaev M, Crittenden DL. Comparing the accuracy of perturbative and variational calculations for predicting fundamental vibrational frequencies of dihalomethanes. J Chem Phys 2018; 148:084102. [DOI: 10.1063/1.5020295] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sergey V. Krasnoshchekov
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow 119991, Russian Federation
| | | | - Norman C. Craig
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074, USA
| | - Marat Sibaev
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
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12
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Baraban JH, Martin‐Drumel M, Changala PB, Eibenberger S, Nava M, Patterson D, Stanton JF, Ellison GB, McCarthy MC. The Molecular Structure of
gauche
‐1,3‐Butadiene: Experimental Establishment of Non‐planarity. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201709966] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Joshua H. Baraban
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
- Current address: Dept. of Chemistry Ben-Gurion University of the Negev Beer-Sheva 84105 Israel
| | - Marie‐Aline Martin‐Drumel
- Harvard-Smithsonian Center for Astrophysics and School of Engineering & Applied Sciences Harvard University Cambridge Massachusetts 02138 USA
- Current address: Institut des Sciences Moléculaires d'Orsay, CNRS Univ. Paris-Sud, Université Paris-Saclay Orsay France
| | - P. Bryan Changala
- JILA, National Institute of Standards and Technology and Department of Physics University of Colorado Boulder CO 80309 USA
| | | | - Matthew Nava
- Department of Chemistry Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA
- Current address: Department of Chemistry Harvard University Cambridge MA 02138 USA
| | - David Patterson
- Department of Physics Harvard University Cambridge MA 02138 USA
- Current address: Department of Physics University of California Santa Barbara CA 93106 USA
| | - John F. Stanton
- Quantum Theory Project Depts. of Chemistry and Physics Univ. of Florida Gainesville FL 32611 USA
| | - G. Barney Ellison
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Michael C. McCarthy
- Harvard-Smithsonian Center for Astrophysics and School of Engineering & Applied Sciences Harvard University Cambridge Massachusetts 02138 USA
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13
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Baraban JH, Martin‐Drumel M, Changala PB, Eibenberger S, Nava M, Patterson D, Stanton JF, Ellison GB, McCarthy MC. The Molecular Structure of
gauche
‐1,3‐Butadiene: Experimental Establishment of Non‐planarity. Angew Chem Int Ed Engl 2018; 57:1821-1825. [DOI: 10.1002/anie.201709966] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Joshua H. Baraban
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
- Current address: Dept. of Chemistry Ben-Gurion University of the Negev Beer-Sheva 84105 Israel
| | - Marie‐Aline Martin‐Drumel
- Harvard-Smithsonian Center for Astrophysics and School of Engineering & Applied Sciences Harvard University Cambridge Massachusetts 02138 USA
- Current address: Institut des Sciences Moléculaires d'Orsay, CNRS Univ. Paris-Sud, Université Paris-Saclay Orsay France
| | - P. Bryan Changala
- JILA, National Institute of Standards and Technology and Department of Physics University of Colorado Boulder CO 80309 USA
| | | | - Matthew Nava
- Department of Chemistry Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA
- Current address: Department of Chemistry Harvard University Cambridge MA 02138 USA
| | - David Patterson
- Department of Physics Harvard University Cambridge MA 02138 USA
- Current address: Department of Physics University of California Santa Barbara CA 93106 USA
| | - John F. Stanton
- Quantum Theory Project Depts. of Chemistry and Physics Univ. of Florida Gainesville FL 32611 USA
| | - G. Barney Ellison
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Michael C. McCarthy
- Harvard-Smithsonian Center for Astrophysics and School of Engineering & Applied Sciences Harvard University Cambridge Massachusetts 02138 USA
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14
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Krasnoshchekov SV, Craig NC, Koroleva LA, Stepanov NF. Anharmonic vibrational analysis of s-trans and s-cis conformers of acryloyl fluoride using numerical-analytic Van Vleck operator perturbation theory. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 189:66-79. [PMID: 28800431 DOI: 10.1016/j.saa.2017.07.062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 07/22/2017] [Accepted: 07/30/2017] [Indexed: 06/07/2023]
Abstract
A new gas-phase infrared (IR) spectrum of acryloyl fluoride (ACRF, CH2CHCFO) with a resolution of 0.1cm-1 in the range 4000-450cm-1 was measured. Theoretical ab initio molecular structures, full quartic potential energy surfaces (PES), and cubic surfaces of dipole moments and polarizability tensor components (electro-optical properties, EOP) of the s-trans and s-cis conformers of the ACRF were calculated by the second-order Møller-Plesset electronic perturbation theory with a correlation consistent Dunning triple-ζ basis set. The numerical-analytic implementation of the second-order operator canonical Van Vleck perturbation theory was employed for predicting anharmonic IR and Raman scattering (RS) spectra of ACRF. To improve the anharmonic predictions, harmonic frequencies were replaced by their counterparts evaluated with the higher-level CCSD(T)/cc-pVTZ model, to form a "hybrid" PES. The original operator representation of the Hamiltonian is analytically reduced to a quasi-diagonal form, integrated in the harmonic oscillator basis and diagonalized to account for strong resonance couplings. Double canonical transformations of EOP expansions enabled prediction of integral intensities of both fundamental and multi-quanta transitions in IR/RS spectra. Enhanced band shape analysis reinforced the assignments. A thorough interpretation of the new IR experimental spectra and existing matrix-isolation literature data for the mixture of two conformers of ACRF was accomplished, and a number of assignments clarified.
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Affiliation(s)
- Sergey V Krasnoshchekov
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991 Moscow, Russian Federation.
| | - Norman C Craig
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074, USA
| | - Lidiya A Koroleva
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991 Moscow, Russian Federation
| | - Nikolay F Stepanov
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, 119991 Moscow, Russian Federation
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15
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Sinha Ray S, Ghosh P, Chaudhuri RK, Chattopadhyay S. Improved virtual orbitals in state specific multireference perturbation theory for prototypes of quasidegenerate electronic structure. J Chem Phys 2017; 146:064111. [DOI: 10.1063/1.4975322] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Pietropolli Charmet A, Stoppa P, Tasinato N, Giorgianni S, Gambi A. Study of the Vibrational Spectra and Absorption Cross Sections of 1-Chloro-1-fluoroethene by a Joint Experimental and Ab Initio Approach. J Phys Chem A 2016; 120:8369-8386. [DOI: 10.1021/acs.jpca.6b07426] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrea Pietropolli Charmet
- Dipartimento
di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Via Torino 155, 30172 Mestre (Ve), Italy
| | - Paolo Stoppa
- Dipartimento
di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Via Torino 155, 30172 Mestre (Ve), Italy
| | - Nicola Tasinato
- Scuola Normale Superiore, Piazza
dei Cavalieri 7, 56126 Pisa (Pi), Italy
| | - Santi Giorgianni
- Dipartimento
di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Via Torino 155, 30172 Mestre (Ve), Italy
| | - Alberto Gambi
- Dipartimento
Politecnico di Ingegneria e Architettura, Università degli Studi di Udine, Via Cotonificio, 108, 33100 Udine (Ud), Italy
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17
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Sibaev M, Crittenden DL. Balancing accuracy and efficiency in selecting vibrational configuration interaction basis states using vibrational perturbation theory. J Chem Phys 2016. [DOI: 10.1063/1.4960600] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Sibaev M, Crittenden DL. An efficient and numerically stable procedure for generating sextic force fields in normal mode coordinates. J Chem Phys 2016; 144:214107. [DOI: 10.1063/1.4953080] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- M. Sibaev
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand
| | - D. L. Crittenden
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand
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