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Enhancement of sensitivity in high-resolution stimulated Raman spectroscopy of gases: Applicaion to the 2ν2 (1285 cm−1) band of CO2

✍ Scribed by R. Saint-Loup; B. Lavorel; G. Millot; C. Wenger; H. Berger

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
532 KB
Volume
21
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

The application of a multiple‐pass gas cell to quasi‐cw stimulated Raman scattering is demonstrated to be a powerful method for significantly increasing the sensitivity. As a consequence, such a device offers the possibility of working in the 0.1–1 Torr pressure range for weak bands. As a striking example, experimental results are given for the 2ν~2~ band of CO~2~ at 1285 cm^−1^. The band is almost completely resolved with a very good signal‐to‐noise ratio. The Raman frequencies and the collisional broadening coefficients are determined as a function of quantum number J. Moreover, the possibility of auto‐stimulated Raman effect on CO~2~ at moderate pressure via the sharp ν~1~ band (1388 cm^−1^) is demonstrated. The first Stokes signal has been measured with a very narrow line width.

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