Ultraviolet absorption spectrum of HOCl
Article first published online: 21 SEP 2012
Copyright 1993 by the American Geophysical Union.
Journal of Geophysical Research: Atmospheres (1984–2012)
Volume 98, Issue D2, pages 2963–2974, 20 February 1993
How to Cite
1993), Ultraviolet absorption spectrum of HOCl, J. Geophys. Res., 98(D2), 2963–2974, doi:10.1029/92JD02522.(
- Issue published online: 21 SEP 2012
- Article first published online: 21 SEP 2012
- Manuscript Accepted: 16 OCT 1992
- Manuscript Received: 4 MAY 1992
The room temperature UV absorption spectrum of HOCl was measured over the wavelength range 200 to 380 nm with a diode array spectrometer. The absorption spectrum was identified from UV absorption spectra recorded following UV photolysis of equilibrium mixtures of Cl2O/H2O/HOCl. The HOCl spectrum is continuous with a maximum at 242 nm and a secondary peak at 304 nm. The measured absorption cross section at 242 nm was (2.1 ± 0.3) × 10−19 cm2 ( 2 σ error limits). These results are in excellent agreement with the work of Knauth et al. (1979) but in poor agreement with the more recent measurements of Mishalanie et al. (1986) and Permien et al. (1988]). An HOCl ν2 infrared band intensity of 230 ± 35 cm−2 atm−1 was determined based on this UV absorption cross section. The present results are compared with these previous measurements and the discrepancies are discussed.