Difference-frequency laser spectroscopy of molecular ions with a hollow-cathode cell: extended analysis of the ν_1 band of H_2D^+

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Abstract
A cooled hollow-cathode cell was used for observation of the infrared spectra of positive ions in the 3-μm region with a difference-frequency laser as a radiation source. About an order-of-magnitude enhancement of the signal intensity was attained, compared with the similar signals obtained with our previous glow-discharge cell. Ten more weaker lines of the ν1 fundamental band of H2D+, which could not be observed in our previous experiment [ J. Chem. Phys. 81, 2869 ( 1984)] were measured. Improved molecular constants were obtained from a least-squares fit including the infrared lines and the two millimeter- and submillimeter-wave lines in the ground state.