Intensity of the second and third OH overtones of H2O2, HNO3, and HO2NO2

Abstract

The 3νOH and 4νOH of H2O2, HNO3, and HO2NO2 have been observed. The band strengths of 3νOH are (7.0 ± 1.8) × 10-20, (2.9 ± 0.7) × 10-20, and (3.8 ± 1.1) × 10-20 cm2 molecules-1 cm-1 for H2O2, HNO3, and HO2NO2, respectively. Those of 4νOH are (4.5 ± 1.6) × 10-21, (2.8 ± 1.0) × 10-21, and (3.0 ± 1.8) × 10-21 cm2 molecules-1 cm-1 for H2O2, HNO3, and HO2NO2, respectively. The uncertainty is for one standard deviation. Assuming excitation of these modes by solar absorption is dissociative for HO2NO2, these measurements confirm that this process will play a small role in the atmospheric photochemistry of the lower stratosphere. Copyright 2000 by American Geophysical Union.