Abstract
Rare gas hydride molecules and triatomic hydrogen molecules were produced in a Cossart-type plasma beam Penning tube specially designed for laser spectroscopic work. A cw dye laser was used to stimulate transitions from theB 2 Π rovibrational levels to theA 2Σ+ levels of argonhydride (40ArH) and argondeuteride (40ArD). The transitions were detected by measuring the decrease of the spontaneous emission from the upper levels, which clearly shows the expected population inversion between the two participating electronic states. With this first laserspectroscopic work on argonhydride and argon deuteride, the classification of the lines of theB 2 Π→A 2Σ+ band as given by Johns 1970 could be checked and was found to be consistent*. Furthermore theQ branches of these bands for ArH and ArD could be completely resolved into their single lines and their wavelengths were measured. The latter allowed the difference between the rotational constants of theA andB electronic states to be directly determined. The method was also applied to triatomic hydrogen. D3. It should be useful for classifying more complicated bands of ArH and of KrH and XeH, which can also be produced in this tube.
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In later theoretical work theB 2 Π state was called 22 Π state [13] andE 2 Π state [12], respectively
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Adolph, N., Heinzel, T., Weidemüller, M. et al. Labelling spectroscopy on argonhydride and argondeuteride in a plasma beam penning tube. Z Phys D - Atoms, Molecules and Clusters 24, 15–23 (1992). https://doi.org/10.1007/BF01436599
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DOI: https://doi.org/10.1007/BF01436599