Abstract

Lead-salt-diode lasers have been used to detect more than 100 absorption lines of H3O+ in an ac discharge by using the velocity-modulation technique. Many lines have been assigned to vibration–rotation transitions in the 1 ← 0+ and 1+ ← 0 components of the ν2 inversion mode of H3O+ with band centers at 954.4 and 525.8 cm−1, respectively. The results for the former band extend those of earlier work and lead to some minor changes in assignment.

© 1985 Optical Society of America

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