INFRARED SPECTRA OF $^{4}HeH^{+}, ^{4}HeD^{+}, ^{3}HeH^{+}$ AND $^{3}HeD^{+}$
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Date
1984
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Publisher
Ohio State University
Abstract
We have extended the earlier $work^{1,2}$ on the infrared spectrum of $_{3}HeH^{+}$, by observing the hot band $v = 2 \leftarrow 1$ of $HeH^{+}$ and fundamental bands of isotopic species $^{3}HeH^{+}$, $^{4}HeH^{+}$, and $^{3}HeD^{+}$. A difference frequency laser system and a diode laser have been used as tunable infrared sources and the ion velocity modulation technique was used for detection. A sealed off discharge tube was used to conserve $^{3}He$. Six to fourteen vibration-rotation lines have been measured for each band. An analysis of the lines gave the following values for the band origins. [FIGURE] All of the molecular constants agreed remarkably well with the results of ab initio calculations. The rotational constants of the four isotopes were used to determine the isotopically independent parameters $\Delta_{10}, \Delta_{10}$, and the $U_{ij}$. The observed variation of line intensities as a function of the $He:H_{2}$ mixing ratio is discussed in terms of simple ion-molecule reaction kinetics.
Description
$^{1}$ D.E. Tolliver, G.A. Kyrala, and W.H. Wing, Phys. Rev. Lett. 43, 1719 (1979) $^{2}$ P. Bernath and T. Amano, Phys. Rev. Lett. 48, 20 (1982)
Author Institution: Department of Chemistry and Department of Astronomy and Astrophysics, The University of Chicago
Author Institution: Department of Chemistry and Department of Astronomy and Astrophysics, The University of Chicago