Collision narrowing of unresolved H2O doublets

Ch. Claveau; Alain Valentin; Victor P. Kochanov; V. N. Saveliev; Leonid N. Sinitsa

doi:10.1117/12.336998

13 January 1999 Collision narrowing of unresolved H₂O doublets

Ch. Claveau, Alain Valentin, Victor P. Kochanov, V. N. Saveliev, Leonid N. Sinitsa

Proceedings Volume 3583, Fifth International Symposium on Atmospheric and Ocean Optics; (1999) https://doi.org/10.1117/12.336998
Event: Fifth International Symposium on Atmospheric and Ocean Optics, 1998, Tomsk, Russian Federation

Abstract

About 150 lines of the (nu) ₂ band of H₂O were measured by Fourier transform spectrometer of Paris VI University, with a spectral resolution of 0.005 cm ^-1. It was found that some of spectrally unresolved doublets reveal a significant collision line narrowing as the pressure of the buffer gas (N₂) increases. Experimental data on such doublet line profiles was processed with a specially developed theory in the hard collision model under the assumption of strong collision line mixing of unresolved doublet lines. The pressure line broadening coefficients also with the line narrowing parameters were obtained. The observed difference in pressure broadening coefficients of the considered doublet (nu) ₁ equals 1879.0194 and (nu) ₂ equals 1879.0195 cm^-1 and nearby singlet lines was explained on the basis of the developed theory.

Citation Download Citation

Ch. Claveau, Alain Valentin, Victor P. Kochanov, V. N. Saveliev, and Leonid N. Sinitsa "Collision narrowing of unresolved H₂O doublets", Proc. SPIE 3583, Fifth International Symposium on Atmospheric and Ocean Optics, (13 January 1999); https://doi.org/10.1117/12.336998

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