Gase und Dämpfe

Larsén, Tage; Cappeller, U.; Stuart, H. A.; Küster, R.

doi:10.1007/978-3-662-43289-1_4

Cited by 5 publications

(2 citation statements)

References 73 publications

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“…The measured polarizabilities are fitted to (13) and the fit parameters a~ 2), including their r.m.s, error, are presented in table 2. The calculated Cauchy coefficients, obtained by applying the iterative procedure given by the combination of (12) and (17) are also presented in table 2. In comparison, theoretical values of Spackman [13], calculated with the time-dependent coupled Hartree-Fock method, using the (6 -31 G + sd + sp) as well as the 'electrical property' basis set given by Liu and Dykstra [40], are also shown.…”

Section: Dipole Polarizability and Cauchy Momentsmentioning

confidence: 99%

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Experimental determination of the dispersion in the mean linear dipole polarizability α(ω) of small hydrocarbons and evaluation of Cauchy moments between 325 nm and 633 nm

Hohm

1993

Molecular Physics

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Print) 1362-3028 (Online) Journal homepage: http://www.tandfonline.com/loi/tmph20 Experimental determination of the dispersion in the mean linear dipole polarizability α(ω) of small hydrocarbons and evaluation of Cauchy moments between 325 nm and 633 nm Uwe Hohm To cite this article: Uwe Hohm (1993) Experimental determination of the dispersion in the mean linear dipole polarizability α(ω) of small hydrocarbons and evaluation of Cauchy moments between 325 nm and 633 nm, Molecular Physics, 78:4, 929-941,The frequency dependent linear mean dipole polarizability a(w) of the hydrocarbons CH4, C2H6, C3Hs, n-C4Hl0, C(CH3)4 (neopentane), C2H4, C3H 6, and cyclo-_C3H 6 has been determined by precise measurements of the refractive index in the frequency range between 0.07198116 a.u. (A = 632.990nm) and 0"1401389a.u. (A = 325-130nrn). This is the first experimental determination of a(w) in the UV frequency region of neopentane and cyclopropane. It will be shown, that the uncertainty in the relative dispersion Aa(w)/Aw of c~(w) is mostly determined by the uncertainty in the frequency of the radiation sources used. In addition, Cauchy moments S(-2), S(-4), S(-6), and S(-8) are calculated with an extended numerical procedure from the measured data sets, showing that a simple Gaussian least-squares fit of a(w) in w 2 is not sufficient to obtain S(-2k). In additon, some data of the relative dispersion of the second refractivity virial coefficient of some of these gases are presented.

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Section: Dipole Polarizability and Cauchy Momentsmentioning

confidence: 99%

“…Of course, many uncertainties are introduced by these procedures. Nevertheless, for numerous small molecules the dispersion of the refractive index, as compiled, e.g., by Lars6n in the Landolt-B6rnstein tables [12], are still used to obtain frequency dependent polarizabilities a(w).…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the dispersion in the mean linear dipole polarizability α(ω) of small hydrocarbons and evaluation of Cauchy moments between 325 nm and 633 nm

Hohm

1993

Molecular Physics

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Ein einfaches Verfahren zur Bestimmung der Dispersion des Brechungsindexes

Kerl

1974

Ber Bunsenges Phys Chem

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Es wird ein Gittermonochromatorals Beleuchtungsquelle für ein Interferometer verwendet. Durch Drehen des Gitters kann die Dispersion des (komplexen) Brechungsindexes einer optisch teildurchlassigen Probe in kurzer Zeit im gesamten zugängigen Wellenzahlbereich kontinuierlich und genau bestimmt werden. Das Verfahren wurde zunächst im sichtbaren Spektralbereich (0,4μ–0,7μ) an Gasen getestet.Die Bedeutung von Dispersionsmessungen wird kurz diskutiert und die Wirkungsweise des Verfahrens heschrieben. An einem Beispiel wird die einfache Auswertung der Messungen gezeigt.

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Some Properties of Small Gas Molecules Determined by Refractive Index Measurements

Kerl

1982

Ber Bunsenges Phys Chem

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Apparare und Methoden / Brechungsindex-Dispusion / Case / Molekuleigenschufren / Sro ffeigenschuften The dispersion of the refractive index of the gases He, Ne, Ar, H,, N,. 0 2 , CH,, and C(CH,), at low densities is determined in the visible wave length range 400 nrn c A I 700 nm by means of scanning-wavelength interferometry. The measurements are fitted by one-term Kramers-Heisenberg dispersion relations and used to calculate some macroscopic and molecular properties like mean polarizabilities, effective eigenenergies and oscillator strengths, oscillator strength sums, Verdet and related constants, Rayleigh scattering cross sections and dispersion force constants. The theoretical background as well as the 4gnificance of the different relations between refractive index and these properties is presented and discussed briefly.

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Gase und Dämpfe

Cited by 5 publications

References 73 publications

Experimental determination of the dispersion in the mean linear dipole polarizability α(ω) of small hydrocarbons and evaluation of Cauchy moments between 325 nm and 633 nm

Experimental determination of the dispersion in the mean linear dipole polarizability α(ω) of small hydrocarbons and evaluation of Cauchy moments between 325 nm and 633 nm

Ein einfaches Verfahren zur Bestimmung der Dispersion des Brechungsindexes

Some Properties of Small Gas Molecules Determined by Refractive Index Measurements

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