Difference frequency laser spectroscopy of the ν1 band of the HO2 radical

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Abstract
The ν1 (O–H stretching) band of the HO2 radical was observed in absorption by using a difference frequency output obtained from an Ar ion laser and a cw dye laser as a source, combined with a multiple‐reflection discharge cell. Zeeman modulation was employed to improve the sensitivity. The HO2 radical was generated directly in the cell by a dc discharge in a mixture of allyl alcohol and oxygen. About 280 lines were observed and analyzed to precisely determine the rotational constants, centrifugal distortion constants, and spin‐rotation interaction constants in the ν1=1 state. The band origin was determined to be 3436.1951(4) cm−1, which is 22 cm−1 higher than the value previously obtained by a matrix isolation study.

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