Rayleigh Depolarization Ratios, Kerr Effects, Polarizabilities, and Hyperpolarizabilities of CH3Br, CH2Br2, CHBr3, and CBr4. Comparison of Experimental and ab Initio Calculated Polarizabilities

Blanch, Ewan W.; Keir, Roland I.; Ritchie, G. L. D.

doi:10.1021/jp020003t

Cited by 6 publications

(2 citation statements)

References 39 publications

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“…Equipment for investigation of the temperature and pressure dependence of the electrooptical Kerr effect in gases and vapors has also been described . Measurements of the electric field-induced birefringences of CH 3 CH 2 CN and (CH 3 ) 2 CHCN at 632.8 nm were made at 10 temperatures (≈340−500 K) within the available span and, at each temperature, over a range of pressures (≈10−30 kPa).…”

Section: Methodsmentioning

confidence: 99%

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of C_s Symmetry: CH₃CH₂C⋮N and (CH₃)₂CHC⋮N

Ritchie

Watson

2004

J. Phys. Chem. A

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The present report describes the further development of a novel experimental route to the four independent components of the anisotropic electric dipole polarizabilities of molecules of C s symmetry, originally applied to CH3NH2 and (CH3)2NH [Ritchie, G. L. D.; Blanch, E. W. J. Phys. Chem. A 2003, 107, 2093−2099] and here extended to CH3CH2CN and (CH3)2CHCN. Once again, the four equations required to evaluate the four components of the optical-frequency (λ = 632.8 nm) polarizabilities are drawn from observations of (1) the temperature dependence of the electrooptical Kerr effect, (2) the Rayleigh depolarization ratio, and (3) the refractive index of the gas, together with (4) a simple bond-additivity model of the polarizability. Although the measurements are difficult and still much less than routine, the procedure is applicable to many other species of this symmetry, for which free-molecule anisotropic polarizabilities have not previously been experimentally accessible.

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Section: Methodsmentioning

confidence: 99%

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of C_s Symmetry: CH₃CH₂C⋮N and (CH₃)₂CHC⋮N

Ritchie

Watson

2004

J. Phys. Chem. A

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“…Improved equipment for measurements of the temperature and pressure dependence of the electrooptical Kerr effect in gases has been described. , Observations of the field-induced birefringences of NH 3 , CH 3 NH 2 , (CH 3 ) 2 NH, and (CH 3 ) 3 N at 632.8 nm typically were made at 12 temperatures (∼295−495 K) within the available span and, at each temperature, over a range of pressures (∼40−400 kPa). The definition of the molar Kerr constant, m K , is , where n and ε r are the refractive index and relative permittivity of the gas in the absence of the field; n X − n Y is the birefringence for XZ - and YZ -polarized light that is induced by the uniform electric field, F X ; and V m is the molar volume.…”

Section: Methodsmentioning

confidence: 99%

Temperature Dependence of the Electrooptical Kerr Effect: Anisotropic Electric Dipole Polarizabilities of NH₃, CH₃NH₂, (CH₃)₂NH, and (CH₃)₃N

Ritchie

Blanch

2003

J. Phys. Chem. A

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The study that is reported here is concerned with the development of an experimental route to the four independent components of the electric dipole polarizability of species of C s symmetry and, in particular, with the specification of the anisotropic polarizabilities of NH 3 , CH 3 NH 2 , (CH 3 ) 2 NH, and (CH 3 ) 3 N, for which a consistent set of data has not been available. It is shown that the four equations required to evaluate the four components of the optical-frequency (λ ) 632.8 nm) polarizabilities of CH 3 NH 2 and (CH 3 ) 2 NH can be drawn from measurements of (1) the temperature dependence of the electrooptical Kerr effect, (2) the Rayleigh depolarization ratio, and (3) the refractive index of the gas together with (4) a simple bond-additivity model of the polarizability. The model uses the polarizabilities of the C 3V species NH 3 and (CH 3 ) 3 N to estimate the off-diagonal polarizabilities of the C s species CH 3 NH 2 and (CH 3 ) 2 NH. To this end, improved equipment has been used to record the vapor-phase Kerr effects of NH 3 , CH 3 NH 2 , (CH 3 ) 2 NH, and (CH 3 ) 3 N over ranges of temperature and pressure. An analysis of the data yields precise values of the anisotropic polarizabilities and, as a bonus, less precise values of the Kerr hyperpolarizabilities of all four molecules and provides a clear demonstration of the utility of the method.

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Accurate Measurement of Raman Depolarization Ratio in Gaseous CO2

Jin¹,

Yu²,

Wang³

et al. 2015

Chinese Journal of Chemical Physics

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The Raman depolarization ratios of gaseous CO2 in the spectral range of 1240–1430 cm−1 are determined with a sensitive photoacoustic Raman spectroscopy, and more accurate data compared to the literature results are presented. The precision of the obtained depolarization ratio is achieved by measuring and fitting the dependence of the PARS signal intensity on the cross angle between the polarizations of two incident laser beams.

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Rayleigh Depolarization Ratios, Kerr Effects, Polarizabilities, and Hyperpolarizabilities of CH₃Br, CH₂Br₂, CHBr₃, and CBr₄. Comparison of Experimental and ab Initio Calculated Polarizabilities

Cited by 6 publications

References 39 publications

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of C_s Symmetry: CH₃CH₂C⋮N and (CH₃)₂CHC⋮N

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of C_s Symmetry: CH₃CH₂C⋮N and (CH₃)₂CHC⋮N

Temperature Dependence of the Electrooptical Kerr Effect: Anisotropic Electric Dipole Polarizabilities of NH₃, CH₃NH₂, (CH₃)₂NH, and (CH₃)₃N

Accurate Measurement of Raman Depolarization Ratio in Gaseous CO2

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Rayleigh Depolarization Ratios, Kerr Effects, Polarizabilities, and Hyperpolarizabilities of CH3Br, CH2Br2, CHBr3, and CBr4. Comparison of Experimental and ab Initio Calculated Polarizabilities

Cited by 6 publications

References 39 publications

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of Cs Symmetry: CH3CH2C⋮N and (CH3)2CHC⋮N

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of Cs Symmetry: CH3CH2C⋮N and (CH3)2CHC⋮N

Temperature Dependence of the Electrooptical Kerr Effect: Anisotropic Electric Dipole Polarizabilities of NH3, CH3NH2, (CH3)2NH, and (CH3)3N

Accurate Measurement of Raman Depolarization Ratio in Gaseous CO2

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Rayleigh Depolarization Ratios, Kerr Effects, Polarizabilities, and Hyperpolarizabilities of CH₃Br, CH₂Br₂, CHBr₃, and CBr₄. Comparison of Experimental and ab Initio Calculated Polarizabilities

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of C_s Symmetry: CH₃CH₂C⋮N and (CH₃)₂CHC⋮N

Experimental Determination of the Anisotropic Electric Dipole Polarizabilities of Molecules of C_s Symmetry: CH₃CH₂C⋮N and (CH₃)₂CHC⋮N

Temperature Dependence of the Electrooptical Kerr Effect: Anisotropic Electric Dipole Polarizabilities of NH₃, CH₃NH₂, (CH₃)₂NH, and (CH₃)₃N