Abstract

The differential Raman cross sections of the main Raman-active vibrations have been measured in the gases N<sub>2</sub>, O<sub>2</sub>, H<sub>2</sub>, CO, NO, CO<sub>2</sub>, SO<sub>2</sub>, N<sub>2</sub>O, H<sub>2</sub>S, NH<sub>3</sub>, ND<sub>3</sub>, CH<sub>4</sub>, C<sub>2</sub>H<sub>6</sub>, and C<sub>6</sub>H<sub>6</sub> using 488.0-nm laser light. The present results are compared with previous measurements made at other wavelengths. The Raman cross sections of the rotational lines in the diatomic gases were also measured, as were the vibrational-rotational lines of O<sub>2</sub> and N<sub>2</sub>. Absolute measurement of the Raman cross sections were performed two ways: (i) by calibrating the Raman spectrometer, and (ii) by comparing the unknown against liquid benzene (for which the Raman cross section has been measured). Results of these measurements compare reasonably well with previous determinations for which corrections for the υ<sup>4</sup> frequency dependence were made.

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