Phenomena of g-u symmetry-breakdown in HD

A. de Lange, E.M. Reinhold, W.M.G. Ubachs

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Abstract

Phenomena associated with the breakdown of inversion symmetry in the HD molecule are reviewed and discussed. A distinction is made between three kinds of physical effects observed in HD spectra. The existence of a small electric dipole moment in the ground state gives rise to vibrational and pure rotational transitions following selection rules of electric dipole transitions. Coupling between electronic states of g and u symmetry occurs, which is associated with the appearance of forbidden lines in the electronic spectrum. This effect occurs predominantly at near coincidences between levels of opposite inversion symmetry and a recently observed example of strongly interacting states (H̄ ′∑
Original languageEnglish
Pages (from-to)257-275
JournalInternational Reviews in Physical Chemistry
Volume21
Issue number2
DOIs
Publication statusPublished - 2002

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