Abstract

An evacuated high-resolution Czerny-Turner spectrograph, which is described in this paper, has been used to determine the strengths <i>S</i> and self-broadening parameters γ<sup>0</sup> for lines in the <i>R</i> branch of the ν<sub>3</sub> fundamental of <sup>12</sup>C<sup>16</sup>O<sub>2</sub> at 298 and at 207 K. The values of γ<sup>0</sup>. at 207 K are greater than those to be expected on the basis of a fixed collision cross section σ. The approximate ratio of the measured cross sections for a given line is σ(<i>T</i><sub>1</sub>)/σ(<i>T</i><sub>2</sub>) = <i>T</i><sub>2</sub>/<i>T</i><sub>1</sub>; although this relation holds for the average of all lines measured, the cross-section ratio is greater than the temperature ratio for lines near the band center and less than the temperature ratio for lines in the wings of the band.

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