KINETIC ENERGY DISTRIBUTION AND THE FORMATION MECHANISM OF $D_{3}$ IN A HOLLOW CATHODE DISCHARGE OF $D_{2}$

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1993

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Ohio State University

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Herzberg and coworkers discovered the electronic transitions of $H_{3}$ and $D_{3}$ in emission in the visible and infrared regions in the cathode glow of cooled hollow cathode discharges, and several Rydberg states of these triangular free radicals were well $characterized^{1}$. A large Doppler width was noticed in these emission spectra and Miderski and Gellene concluded that a dominant channel for formation of $H_{3}$ is through the dissociative recombination of $H^{+}_{5}$ by analyzing the emission line shape and kinematic $modeling^{2}$. We have observed the 3s $^{2}A_{1}^{\prime}-3p {^{2}}E^{\prime}(3600 cm^{-1}$ band) and $3d-3p {^{2}}E^{\prime}(3950 cm^{-1}$ band) transitions of $D_{3}$ in absorption in a hollow cathode discharge using a difference frequency laser system. The absorption line profiles exhibit a non-thermal velocity distribution. As the lifetimes of the states involved in these transitions are much shorter than the collision intervals in our experimental conditions, the velocity distribution carries pertinent information about formation mechanism of $D_{3}$. In this presentation, the observed line profiles will be discussed in terms of the dissociative recombination of $D^{+}_{3}$ and formation mechanism of $D_{3}$.

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$^{1}$ G. Herzberg et al, Can., J. Phys. 58, 1238 (1980); ibid. 58, 1250(1980);ibid.59,428(1981);ibid.60,1261 (1982). $^{2}$ C. A. Miderski and G. I. Gellene, J. Chem. Phys.88, 5331(1988).
Author Institution: Herzberg Institute of Astrophysics, National Research Council of Canada

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