Second hyperpolarizabilities and static and optical-frequency polarizabibility anisotropies of benzene, 1,3,5-trifluorobenzene, and hexafluorobenzene

Journal Article · Thu Nov 02 04:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100359a041· OSTI ID:6752361

Gentle, I R ^[1]; Ritchie, G L.D. ^[2]

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1. Univ. of Sydney, New South Wales (Australia)
2. Univ. of New England, New South Wales (Australia)

Measurements of the electrooptical Kerr effects at 632.8 nm of gaseous benzene, 1,3,5-trifluorobenzene, and hexafluorobenzene over a range of temperature ({approx} 315-490 K) and pressure ({approx} 10-90 kPa) are reported. Analyses of the temperature dependences show that for all three molecules the temperature-independent contribution to the effect, which arises from distortion of the electronic structure by the electric field, is negligibly small in comparison with the temperature-dependent contribution from molecular orientation. Reliable values of the static polarizability anisotropies are also obtained, and these are compared with optical-frequency polarizability anisotropies derived from Rayleigh depolarization ratios. Because of the oppositely signed vibrational contributions in benzene and hexafluorobenzene, the ratio of the static to the optical-frequency anisotropy is less than unity for benzene but greater than unity for hexafluorobenzene. Such an outcome effectively vitiates the common assumption that the ratio of the anisotropies can be approximated by the ratio of the mean static and optical-frequency polarizabilities.

• OSTI ID: 6752361
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:22; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AROMATICS
BENZENE
DATA
DATA ANALYSIS
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
KERR EFFECT
MEASURING INSTRUMENTS
MEASURING METHODS
MEDIUM PRESSURE
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHYSICAL PROPERTIES