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The ir spectrum of interstitial HD in Si provides unique insight into the rotational motion of interstitial H₂ because the rotational-vibrational transitions for the heteronuclear HD molecule are subject to less restrictive selection rules. ir lines for transitions between rotational-vibrational states of the interstitial HD molecule with rotational quantum numbers $J=0$, 1, and 2 have been observed. The assignment of the rotational-vibrational spectrum of interstitial HD, with additional transitions that occur for HD but not for H₂ or D₂, is confirmed by uniaxial stress results.
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Shi et al. (2005) studied this question.
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