INFRARED SPECTROSCOPY OF $(CH_{3}Cl-ORTHO-H_{2})_{n}$ CLUSTERS IN SOLID PARAHYDROGEN
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Date
2004
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Publisher
Ohio State University
Abstract
$CH_{3}Cl$ doped solid parahydrogen $(p-H_{2})$ crystals have been studied using high-resolution FT-IR. Similar to related studies of $CH_{3}F$ in solid $p-H_{2}$, multiplet structures are observed in the C-Cl stretch region, which are assigned to clustering of the $CH_{3}Cl$ with ortho-$H_{2}$ molecules present in the sample. In this study individual vibrational absorptions are observed for clusters in the size range of $n=0-5$. In contrast with the $CH_{3}F studies,^{a}$ at low temperature $(T=1.8 K)$ absorptions features $2.8 cm^{-1}$ to the blue of the main features are observed to grow in intensity. These low temperature absorption features are believed to be due to $CH_{3}Cl$ in a new structurally distinct crystal environment that must occur by reorganization of the solid hydrogen around the $CH_{3}Cl$ impurity at low temperature. Experimental results and analysis will be presented to support this hypothesis.
Description
$^{a}$ K. Yoshioka and D. T. Anderson, J. Chem. Phys. 119, 4731 (2003).
Author Institution: Department of Chemistry, University of Wyoming
Author Institution: Department of Chemistry, University of Wyoming