Mean polarizabilities and second optical and density virial coefficients of CH3OH and CCl2F2 between 300 and 355 K

Ber Bunsenges Phys Chem

Varchmin

1992

The dependence of the mean dipole polarizability α(ω,T, ρ) of small molecules in the gas phase on electromagnetic radiation frequency ω, temperature T, and molar density ρ is discussed. Experimental results are presented for the noble gases, the molecular gases H2, N2, O2, CO2, CH4, C(CH3)4, CH3OH, CF2Cl2, and the gas mixture air. Hints to some rather unusual effects concerning α(ω,T, ρ) are given, too. In each case α(ω,T, ρ) was derived from precise interferometric measurements of the refractive index n(ω,T, ρ) of the gas in the visible (VIS) frequency range.

Section: The Temperature Dependence Of A(w T)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…However, to obtain bR (0, T ) itself, so-called expansion techniques have to be used, which are more elaborate and rather tricky to handle (see e.g. [24,30,31] and $2.4).…”

Section: Introductionmentioning

confidence: 99%

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Polarizability α (ω, T, ρ) of Small Molecules in the Gas Phase

Kerl

Ber Bunsenges Phys Chem

Varchmin

1992

“…Even nowadays, experiments to determine B r (CO, T) are extremely difficult to carry out (e.g. [10][11][12][13]) and therefore are often performed at one temperature and with one frequency of the measuring light only. Systematic investigations, both theoretical and experimental of the co-and T-dependence of the refractivity virial coefficients are scarce [11,14], and due to the quite large error bounds of the experimental data only of limited value.…”

Section: Introductionmentioning

confidence: 99%

Frequency-and Temperature-Dependence of Second Refractivity Virial Coefficients

Zeitschrift Für Naturforschung A

1993

A reasonable heuristic extrapolation of a theory given by Buckingham is used to estimate the frequency-and temperature-dependence of the second refractivity virial coefficient. The calculations are carried out for the atoms He, Ne, Ar, Kr, Xe and the small molecules H 2 , N 2 , 0 2 , HCl, C0 2 , N 2 0, NH 3 , CH 4 , C 2 H 4 , and SF 6 . In some cases the frequency-dependence of B R (co, T) is compared with experimental values, showing sometimes considerable deviations between experiment and the heuristic approach used in this work.

The Importance of the Mean Dipole Polarizability α(ω,T,ρ) of Small Molecules in Physics and Chemistry of the Atmosphere

Kerl

Ber Bunsenges Phys Chem

Varchmin

1992

Self Cite

In this contribution we discuss briefly some experimental results of the mean dipole volume polarizability ct(w,T,e) of some small molecules as a function of electromagnetic radiation frequency w (dispersion), temperature T, and molar density @ of the corresponding gases, which should be of interest in physics and chemistry of the atmosphere. Selected gases are the noble gases, the molecular gases H2, N2, 02, C02, CH4, C(CH3)4. CH,OH, CF2CI2, and the gas mixture air. A more detailed discussion including an extended list of references is given elsewhere [I].