High-Resolution Infrared Spectroscopy of Molecular Ions

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Scientific paper

Experimental techniques of high-resolution infrared absorption spectroscopy are described with an emphasis on the modulated hollow-cathode discharge techniques. Among the recent results, the ν 1 fundamental band of HOCS+ (ν 0 = 3435.16 cm-1) and the X2Pi and a4Σ - system of NH+ (ν 0 = 2903.17 cm-1 in X2Pi state, ν 0 = 2544.30 cm-1 in a4Σ - state, and Δ E(a4Σ --X2Pi ) = 323.90 cm-1) are presented to illustrate the quality and type of information that the high-resolution ion spectroscopy can provide. Another topic discussed is the abundance ratio [HCO+]/[HOC+] as measured in the laboratory and its astrophysical implications. The measurement has been made possible by our recent detection of the ν 1 fundamental band of HOC+ (ν 0 = 3268.03 cm-1). A rate-equation analysis was performed by assuming a reaction scheme to derive the rate constants of several key reactions.

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