NEW INFRARED TRANSITIONS OF SOLID PARAHYDROGEN IN THE SPECTRAL REGION 7900 - 9900 $cm^{-1}$
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Date
1996
Journal Title
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Publisher
Ohio State University
Abstract
In our most recent measurements of infrared transitions of solid parahydrogen with low ortho impurities, using a White-type external multireflection system $^{a}$ for a sample path length of 38 cm, we have detected new extremely weak features in the spectral region 7900 - 9900 $cm^{-1}$. Among them are the single transition $$Y_{1\leftarrow 0}(0)\mbox{ at } 7991.85 (1)\mbox{ cm }^{-1}$$ and the double transitions $$Q_{1\leftarrow 0}(0)+Q_{1\leftarrow 0}(0)\mbox{ at } 8306.0 (1)\mbox{ cm }^{-1}$$$$U_{1\leftarrow 0}(0)+Q_{1\leftarrow 0}(0)\mbox{ at } 9407.67 (5)\mbox{ cm }^{-1}$$$$Q_{1\leftarrow 0}(0)+S_{1\leftarrow 0}(0)\mbox{ at } 9747.8 (1)\mbox{ cm }^{-1}$$$$U_{1\leftarrow 0}(0)+Q_{1\leftarrow 0}(0)\mbox{ at } 9837.34 (5)\mbox{ cm }^{-1}$$ The $Y_{1\leftarrow 0}(0)$ transition is the second transition with $\Delta J = 8$ observed in a molecular spectrum after the $Y_{0\leftarrow 0}(0)$ $transition ^{b}$ and is even weaker than the latter by an appreciable factor. Intensity parameters will be reported for all of these transitions. The data were taken at a sample temperature of 12.3 K.
Description
$^{a}$R. Steinhoff, K. V. S. R. M. Winnewisser, Appl. Optics 32, 6577-6581 (1993). $^{b}$.R. A. Steinhoff, B. P. Winnewisser and M. Winnewisser, Phys. Rev. Lett. 73, 2833 - 2836 (1994).
Author Institution: Physikalisch-Chemisches Institute, Justus-Liebig-Universit\""{a}t; Justus-Lisbig-Universit\""{a}t, Justus-Liebig-Universit\""{a}t; Justus-Lisbig-Universit\""{a}t, Justus-Liebig-Universit\""{a}t
Author Institution: Physikalisch-Chemisches Institute, Justus-Liebig-Universit\""{a}t; Justus-Lisbig-Universit\""{a}t, Justus-Liebig-Universit\""{a}t; Justus-Lisbig-Universit\""{a}t, Justus-Liebig-Universit\""{a}t