Abstract
We determined the effective line strengths of the trans conformer of nitrous acid (HONO) near 1275cm−1 (R-branch of ν3 mode, NOH bend) and of the cis conformer at 1660cm−1 (R-branch of ν2 mode, NO stretch), both at a spectral resolution of 0.001cm−1 by tunable infrared laser differential absorption spectroscopy (TILDAS) utilizing continuous-wave quantum cascade (cw-QC) lasers. Absorbance of one conformer was measured while simultaneously quantifying the mixing ratio of total HONO by catalytic conversion to nitric oxide (NO) followed by calibrated absorption spectroscopy. Line strengths obtained here are consistent with previously reported band strengths for the trans conformer but are lower by a factor of approximately 2.4 for the cis conformer.
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