Reduced absorption coefficient in wings of the Na-D doublet broadened by O2, N2, CO2 and H2O molecules.

Details Reduced absorption coefficient in wings of the Na-D doublet broadened by O2, N2, CO2 and H2O molecules. Reduced absorption coefficient in wings of the Na-D doublet broadened by O2, N2, CO2 and H2O molecules.

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jqsrt..61...73n&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 61, issue 1, pp. 73-82

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Sodium Lines: Absorption Coefficient, Sodium Lines: Line Broadening

Scientific paper

The new experimental data on the reduced absorption coefficient K(Δσ) in far wings of the Na-D doublet broadened by O2 and N2 molecules are reported. These profiles were measured in the blue wing of the Na-D2 line from about 2.5-1000 cm-1 and in the red wing of the Na-D1 line from about 2.5-2500 cm-1 with respect to the corresponding line center. The measurements were performed by the absorption - emission method in the uniform, premixed, laminar, shielded C2H2/O2 and C2H2/O2/N2 flames with sodium seed at T1 = 2105 K and T2 = 2135 K, respectively, and a pressure of 1 atm. The new wing profiles Kj(Δσ) (j = O2,N2) an compared with the Kj(Δσ) (j = CO2,H2O) measured by the authors earlier. It is shown, that the K(O2)(Δσ), K(N2)(Δσ), K(CO2)(Δσ) and K(H2)(Δσ) profiles differ from each other by one or two orders of magnitude in the far quasi-static region (Δσ > 100 cm-1), while this difference is less than the factor 2 in the impact region (Δσ < 10 cm-1). On the basis of the obtained experimental data a set of the Lennard-Jones (6-12) interaction potentials for the Na(3S,3P)-Mj pairs (j = N1, O2, CO2, H2O) was proposed.

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