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Lineshifts in the Fundamental Band of CO: Confirmation of Experimental Results for N2 and Comparison with Theory

✍ Scribed by Caiyan Luo; R. Berman; Adriana Predoi-Cross; J.R. Drummond; A.D. May

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 79 KB
Volume: 196
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.1999.7866

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✦ Synopsis

We have used a three-channel version of a tunable difference frequency laser spectrometer to measure the collisionally induced lineshifts at room temperature for 26 lines of the fundamental band of CO perturbed by nitrogen. Each lineshift was obtained directly by comparing the line center positions of two simultaneous recordings, one for a pressure-shifted line, and the other for the same line in pure CO line at very low pressure. The experimental results are found to be in complete agreement with earlier measurements and confirm that shifts as small as 3 MHz may be measured in such a system. Our results are compared with theoretical calculations. The part of the shifting coefficient antisymmetric with respect to a change in sign of the line number m, is in disagreement with the calculations.

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