Abstract
The high-resolution spectra (0.012 cm−1) of the 3ν1+ ν2combination band of hypochlorous acid HO35(37)Cl in the near infrared (∼11 478 cm−1) have been measured using a titanium:sapphire intracavity laser absorption (ICLA) spectrometer. Line assignments, absolute intensities, and the total band intensity for both isotopomers are reported. In the course of the band analysis twoKabranches (Ka= 2,3) were found to be perturbed via low-order Fermi-type (anharmonic) resonances by a dark perturber which has been identified to be the 2ν1+ 2ν2+ 3ν3state. The data are compared with intensity predictions from simple empirical models and discussed with regard to detection limits for this molecule in the near infrared spectral region of the atmosphere.
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