Shapes and Breadths of Some Molecular Rotation-Vibration Band Lines Perturbed by Rare Gases

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Abstract
The shape of absorption lines of HCl and C2H2 broadened with krypton and xenon as foreign gases is shown to be that due to collision broadening. Corrections for instrumental width are made in the manner described by Pigott and Rank to determine the half‐intensity width. These widths show a small J dependence with low‐J lines being the broadest. No difference between the widths of P and R lines of the same J could be detected. For high J's the quotient of the shift of the line and the width of the line is approximately constant for krypton and xenon. The breadth of HCl and C2H2 lines are not markedly different in spite of the difference in dipole moment. No asymmetry of lines perturbed by these foreign gases was observed.

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