MICROWAVE COLLISION DIAMETERS FOR THE $H_{2}CO$ MOLECULE
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Date
1972
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Ohio State University
Abstract
Collision diameters for some select transitions in the rotational spectrum of $H_{2}CO$ have been determined using pressure broadening of the spectral lines. Transitions of the type $\Delta J = 0$ and $\Delta \tau = 1$ with $1\leq J\leq 6$ were investigated for both self-broadening and foreign gas brodening (He and $H_{2}$) of the spectral lines. Pressure ranges from 0.001 Torr to 0.1 Torr were explored in obtaining the line width parameters $\Delta \nu_{0}$ for each transition. Collision diameters were found to range over 12 {\AA} to 35 {\AA} for $H_{2}CO - H_{2}CO$ interaction, 5 {\AA} to 8 {\AA} for $H_{2}CO - H_{2}$ interaction and 4 {\AA} to 9 {\AA} for $H_{2}CO - $He interaction.
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Author Institution: Department of Physics, North Texas State University