Spectroscopy of the H⋯H+and D⋯D+charge/induced-dipole complexes

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Abstract
The first excited electronic state of the hydrogen molecular ion is essentially repulsive, but exhibits a shallow potential well with a minimum at 6.64 Å because of the long-range HH+ charge/induced-dipole interaction. This well supports a small number of stable vibration–rotation levels, and we have observed an infrared electronic spectrum of the D+ 2 ion arising from transitions to the DD+ levels from high-lying vibration–rotation levels of the ground state. We have also detected two microwave electronic transitions in D+ 2 and one in H+ 2, thereby confirming the existence of these long-range states. This paper describes the principles, experimental techniques and interpretation of these studies.