# NEW OBSERVATIONS OF ELECTRONIC TRANSITIONS OF $H_{3}$ AND $D_{3}$ IN THE INFRARED AND VISIBLE REGIONS

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 Title: NEW OBSERVATIONS OF ELECTRONIC TRANSITIONS OF $H_{3}$ AND $D_{3}$ IN THE INFRARED AND VISIBLE REGIONS Creators: Majewski, W. A.; McKellar, A. R. W.; Sadovskii, D.; Vervloet, M.; Watson, J. K. G. Issue Date: 1991 Abstract: Extensive spectra of the $H_{3}$ and $D_{3}$ molecules have been observed in the infrared and visible regions using two different sources; one is a quartz nozzle of Droege-Engelking $type^{1}$, in which a mixture of $H_{2}$ or $D_{2}$ with Ar was subjected to a high-voltage discharge; and the other is the hollow-cathode discharge source using pure $H_{2}$ or $D_{2}$, described in previous $Symposia^{2}$. In the nozzle source the Ar apparently quenches the normal $H_{2}$ or $D_{2}$ emission, and the lines of $H_{3}$ or $D_{3}$ can readily be distinguished from those of atomic Ar, or ArH or ArD by their greater Doppler width. In the hollow-cathode source, the $H_{3}$ or $D_{3}$ lines are distinguished from those of $H_{2}$ or $D_{2}$ by the pressure dependence of their relative intensities. The new spectra will be compared with the original $spectra^{3-6}$, which had rather extensive interference in some regions due to $H_{2}$ or $D_{2}$ lines. URI: http://hdl.handle.net/1811/12486 Other Identifiers: 1991-TA-12