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Proceedings Paper

Temperature dependence of the absorption of nitrous oxide in the quartz ultraviolet
Author(s): Vladimir N. Saveljev
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Paper Abstract

The ultraviolet absorption of N2O has been studied by many investigators. References to earlier works are given by Zelikoff, Watanabe and Inn. There is general agreement that from 168 nm upwards nitrous oxide shows weak continuous absorption which reaches a maximum variously placed at 182 and 184 nm. Above 184 nm the absorption rapidly decreases. The weak character of the absorption suggests that the transitions in this region are forbidden. Any spectral structure in this region is absent therefore it is difficult to say what electronic transitions involved here. For the detection of N2O it is useful the knowledge of absorption coefficient N2O at 180 - 300 nm for different temperature. The dependence of the intensity of absorption on temperature was noted by Nicolle and Vodar and studied later by Holliday and Reuben. It is found that absorption increased rapidly with temperature. A graph of the logarithm of the extinction coefficient at 230 nm against the reciprocal temperature gave almost straight line with a slope corresponding to 240 nm. The absence of any fine structure of continuum is the reason to obtain the empirical formula for the calculation of absorption coefficient N2O at 180 - 300 nm and temperature 290 - 2000 degrees Kelvin. Our absorption coefficient K, in cm-1, is defined by I/I0 equals exp(minus Kx) where x is the layer thickness of nitrous oxide in cm reduced to S.T.P. To obtain the formula we used the expression for absorption coefficient at continuous profile of vibronic transition.

Paper Details

Date Published: 3 March 1997
PDF: 3 pages
Proc. SPIE 3090, 12th Symposium and School on High-Resolution Molecular Spectroscopy, (3 March 1997); doi: 10.1117/12.267740
Show Author Affiliations
Vladimir N. Saveljev, Institute of Atmospheric Optics (Russia)


Published in SPIE Proceedings Vol. 3090:
12th Symposium and School on High-Resolution Molecular Spectroscopy

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