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Farrell A, González-Jiménez M, Ramakrishnan G, Wynne K. Low-Frequency (Gigahertz to Terahertz) Depolarized Raman Scattering Off n-Alkanes, Cycloalkanes, and Six-Membered Rings: A Physical Interpretation. J Phys Chem B 2020; 124:7611-7624. [PMID: 32790389 PMCID: PMC7476039 DOI: 10.1021/acs.jpcb.0c03769] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 08/06/2020] [Indexed: 11/29/2022]
Abstract
Molecular liquids have long been known to undergo various distinct intermolecular motions, from fast librations and cage-rattling oscillations to slow orientational and translational diffusion. However, their resultant gigahertz to terahertz spectra are far from simple, appearing as broad shapeless bands that span many orders of magnitude of frequency, making meaningful interpretation troublesome. Ad hoc spectral line shape fitting has become a notoriously fine art in the field; a unified approach to handling such spectra is long overdue. Here we apply ultrafast optical Kerr-effect (OKE) spectroscopy to study the intermolecular dynamics of room-temperature n-alkanes, cycloalkanes, and six-carbon rings, as well as liquid methane and propane. This work provides stress tests and converges upon an experimentally robust model across simple molecular series and range of temperatures, providing a blueprint for the interpretation of the dynamics of van der Waals liquids. This will enable the interpretation of low-frequency spectra of more complex liquids.
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Affiliation(s)
- Andrew
J. Farrell
- School of Chemistry, University
of Glasgow, Glasgow G12 8QQ, United Kingdom
| | | | | | - Klaas Wynne
- School of Chemistry, University
of Glasgow, Glasgow G12 8QQ, United Kingdom
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2
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Water-mediated weakening of inter-ionic interactions in aqueous mixtures of ionic liquid: An investigation combining quantum chemical calculations and molecular dynamics simulations. Chem Phys 2019. [DOI: 10.1016/j.chemphys.2019.04.027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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3
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Bender JS, Fourkas JT, Coasne B. Empirical Analysis of Optical Kerr Effect Spectra: A Case for Constraint. J Phys Chem B 2017; 121:11376-11382. [PMID: 29161049 DOI: 10.1021/acs.jpcb.7b09751] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ultrafast optical Kerr effect (OKE) spectroscopy is a widely used method for studying the depolarized, Raman-active intermolecular dynamics of liquids. Through appropriate manipulation of OKE data, it is possible to determine the reduced spectral density (RSD), which is the Bose-Einstein-corrected, low-frequency Raman spectrum with the contribution of diffusive reorientation removed. OKE RSDs for van der Waals liquids can often be fit well to an empirical function that is the sum of a Bucaro-Litovitz function and an antisymmetrized Gaussian (AG). Although these functions are not directly representative of specific intermolecular dynamics, the AG fit parameters can provide useful insights into the microscopic properties of liquids. Here we show that fits using the AG function are typically not well-determined, and that equally good results can be obtained with a wide range of fitting parameters. We propose the use of a physically motivated constraint on the amplitude of the AG function, and demonstrate that this constraint leads to more intuitive trends in the fit parameters for temperature-dependent RSDs in 1,3,5-trifluorobenzene and hexafluorobenzene.
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Affiliation(s)
| | | | - Benoit Coasne
- Université Grenoble Alpes, CNRS, LIPhy , 38000 Grenoble, France
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4
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Heisler IA, Mazur K, Meech SR. Raman vibrational dynamics of hydrated ions in the low-frequency spectral region. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.09.066] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Bender JS, Cohen SR, He X, Fourkas JT, Coasne B. Toward in Situ Measurement of the Density of Liquid Benzene Using Optical Kerr Effect Spectroscopy. J Phys Chem B 2016; 120:9103-14. [PMID: 27472265 DOI: 10.1021/acs.jpcb.6b06421] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | - Benoit Coasne
- Laboratoire
Interdisciplinaire de Physique (LIPhy), Université Grenoble Alpes and CNRS (UMR 5588), F-38000 Grenoble, France
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6
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Bender JS, Coasne B, Fourkas JT. Assessing Polarizability Models for the Simulation of Low-Frequency Raman Spectra of Benzene. J Phys Chem B 2014; 119:9345-58. [DOI: 10.1021/jp509968v] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- John S. Bender
- Department of Chemistry & Biochemistry, ‡Institute for Physical Science and Technology, §Maryland NanoCenter, and ∥Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, United States
- Multiscale Materials Science for Energy and Environment, UMI 3466
CNRS-MIT, and #Department
of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachussetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Benoit Coasne
- Department of Chemistry & Biochemistry, ‡Institute for Physical Science and Technology, §Maryland NanoCenter, and ∥Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, United States
- Multiscale Materials Science for Energy and Environment, UMI 3466
CNRS-MIT, and #Department
of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachussetts Avenue, Cambridge, Massachusetts 02139, United States
| | - John T. Fourkas
- Department of Chemistry & Biochemistry, ‡Institute for Physical Science and Technology, §Maryland NanoCenter, and ∥Center for Nanophysics and Advanced Materials, University of Maryland, College Park, Maryland 20742, United States
- Multiscale Materials Science for Energy and Environment, UMI 3466
CNRS-MIT, and #Department
of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachussetts Avenue, Cambridge, Massachusetts 02139, United States
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7
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Biswas R, Das A, Shirota H. Low-frequency collective dynamics in deep eutectic solvents of acetamide and electrolytes: A femtosecond Raman-induced Kerr effect spectroscopic study. J Chem Phys 2014; 141:134506. [DOI: 10.1063/1.4897207] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Affiliation(s)
- Ranjit Biswas
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, J. D. Block, Sec. III, Salt Lake, Kolkata 700 098, West Bengal, India
| | - Anuradha Das
- Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, J. D. Block, Sec. III, Salt Lake, Kolkata 700 098, West Bengal, India
| | - Hideaki Shirota
- Department of Nanomaterial Science and Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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8
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Shirota H, Biswas R. Intermolecular/Interionic Vibrations of 1-Methyl-3-n-octylimidazolium Tetrafluoroborate Ionic Liquid and H2O Mixtures. J Phys Chem B 2012; 116:13765-73. [DOI: 10.1021/jp307436t] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hideaki Shirota
- Department of Nanomaterial Science & Department of Chemistry, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Ranjit Biswas
- Chemical, Biological and Macromolecular
Sciences, S. N. Bose National Centre for Basic Sciences, J. D. Block, Sec.III, Salt Lake, Kolkata 700 098, West Bengal,
India
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9
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Palombo F, Meech SR. Dynamics of Formamide Ionic Solutions Investigated by Ultrafast Optical Kerr Effect. J Phys Chem B 2012; 116:13481-9. [DOI: 10.1021/jp3087418] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francesca Palombo
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United
Kingdom
| | - Stephen R. Meech
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United
Kingdom
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Park S, Kim J, Scherer NF. Two-dimensional measurements of the solvent structural relaxation dynamics in dipolar solvation. Phys Chem Chem Phys 2012; 14:8116-22. [PMID: 22555862 DOI: 10.1039/c2cp40519a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Resonant-pump polarizability response spectroscopy (RP-PORS) is based on an optical heterodyne detected transient grating (OHD-TG) method with an additional resonant pump pulse. In RP-PORS, the resonant pump pulse excites the solute-solvent system and the subsequent relaxation of the solute-solvent system is monitored by the OHD-TG spectroscopy. RP-PORS is shown to be an excellent experimental tool to directly measure the solvent responses in solvation. In the present work, we extended our previous RP-PORS (Park et al., Phys. Chem. Chem. Phys., 2011, 13, 214-223) to measure time-dependent transient solvation polarizability (TSP) spectra with Coumarin153 (C153) in acetonitrile. The time-dependent TSP spectra showed how the different solvent intermolecular modes were involved in different stages of the solvation process. Most importantly, the inertial and diffusive components of the solvent intermolecular modes in solvation were found to be spectrally and temporally well-separated. In a dipolar solvation of C153, high-frequency inertial solvent modes were found to be driven instantaneously and decay on a subpicosecond timescale while low-frequency diffusive solvent modes were induced slowly and decayed on a picosecond timescale. Our present result is the first experimental manifestation of frequency-dependent solvent intermolecular response in a dipolar solvation.
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Affiliation(s)
- Sungnam Park
- Department of Chemistry, Korea University, Seoul, 136-701, Korea.
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11
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Sun X, Stratt RM. The molecular underpinnings of a solute-pump/solvent-probe spectroscopy: the theory of polarizability response spectra and an application to preferential solvation. Phys Chem Chem Phys 2012; 14:6320-31. [DOI: 10.1039/c2cp24127g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Shirota H. Intermolecular Vibrations and Diffusive Orientational Dynamics of Cs Condensed Ring Aromatic Molecular Liquids. J Phys Chem A 2011; 115:14262-75. [DOI: 10.1021/jp208389n] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Hideaki Shirota
- Department of Nanomaterial Science, Graduate School of Advanced Integration Science & Department of Chemistry, Faculty of Science, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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13
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Yamaguchi S, Mazur K, Heisler IA, Shirota H, Tominaga K, Meech SR. Low-frequency modes of the benzoic acid dimer in chloroform observed by the optical Kerr effect. J Chem Phys 2011; 135:134504. [DOI: 10.1063/1.3635778] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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14
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Shirota H, Kato T. Intermolecular Vibrational Spectra of C3v CXY3 Molecular Liquids, CHCl3, CHBr3, CFBr3, and CBrCl3. J Phys Chem A 2011; 115:8797-807. [DOI: 10.1021/jp203255u] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Hideaki Shirota
- Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
- Department of Chemistry, Faculty of Science, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
| | - Tatsuya Kato
- Department of Nanomaterial Science, Graduate School of Advanced Integration Science, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan
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15
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Kato T, Shirota H. Intermolecular vibrational modes and orientational dynamics of cooperative hydrogen-bonding dimer of 7-azaindole in solution. J Chem Phys 2011; 134:164504. [DOI: 10.1063/1.3583642] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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16
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Palombo F, Paolantoni M, Sassi P, Morresi A, Giorgini MG. Molecular dynamics of liquid acetone determined by depolarized Rayleigh and low-frequency Raman scattering spectroscopy. Phys Chem Chem Phys 2011; 13:16197-207. [DOI: 10.1039/c1cp21806a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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17
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Manfred K, He X, Fourkas JT. Assessing the role of moment of inertia in optical Kerr effect spectroscopy. J Phys Chem B 2010; 114:12096-103. [PMID: 20738116 DOI: 10.1021/jp106249t] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Optical Kerr effect (OKE) spectroscopy allows for the acquisition of high-quality, Bose-Einstein-corrected, low-frequency Raman spectra in liquids. However, the assignment of a molecular interpretation to these spectra remains an open problem. To address this issue, here we present an OKE study of benzene and four of its isotopologues. Our results indicate that hindered rotations are the major contributor to the OKE reduced spectral density (RSD) over the entire intermolecular spectral region (0-250 cm(-1)). We also have found that isotopologues with six (13)C atoms have RSDs that are enhanced at frequencies below 30 cm(-1). We further demonstrate that the collective orientational correlation time of these liquids scales with the inverse square root of the tumbling moment of inertia, indicating that there is strong translation-rotation coupling in benzene.
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Affiliation(s)
- Katherine Manfred
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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