VELOCITY DEPENDENCE OF ROTATIONAL ENERGY TRANSFER RATES IN $Na_{2}{^{*}}$-Xe
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Date
1980
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Ohio State University
Abstract
We have used a new $technique^{1}$ to measure the velocity dependence of the Rotational Energy transfer (RET) rate constants for the process \[Na^{*}_{2}(j_{i}) + Xe \to Na^{*}_{2}(j_{i} + \Delta) + Xe\] Where $j_{i}$ is the initial rotational quantum number and is the change in rotational quantum number. By tuning a single-mode dye laser across the Doppler profile of a molecular resonance we can very the average relative velocity from $450^{\circ} K$ (line center) to $2400^{\circ} K$ (=2 Ghz. detuned). We made $measurements^{2}$ for four different values of $\Delta$ for each of three $J_{i}$’s. Cross sections for $j_{i}=66$ increase with velocity whereas those for $j_{i}=38$ and 16 stay constant or decrease. A dramatic decrease is observed for $j_{i}=164$ and large $\Delta$.
Description
This work supported by Air Force office of scientific Research. $^{1}$. W. D. Philips and D. E. Pritchard, phys. Rev. Lett. 33, 1254 (1974). $^{2}$. N. Smith, T. A. Bruner, and D. E. Pritchard, phys. Rev. Lett. 43, 693 (1979).
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