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Ultraviolet and infrared absorption cross sections of gas phase HO 2 NO 2
Author(s) -
Graham Richard A.,
Winer Arthur M.,
Pitts James N.
Publication year - 1978
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl005i011p00909
Subject(s) - infrared , photodissociation , stratosphere , analytical chemistry (journal) , absorption (acoustics) , ultraviolet , gas phase , molecule , torr , infrared spectroscopy , materials science , phase (matter) , chemistry , optics , physics , photochemistry , atmospheric sciences , optoelectronics , organic chemistry , composite material , thermodynamics , chromatography
Ultraviolet absorption cross sections for gas‐phase HO 2 NO 2 have been measured from 190 to 330 nm at 269 K and 20 torr total pressure. The HO 2 NO 2 cross sections vary smoothly from 1.6 × 10 −17 cm² molecule −1 at 190 nm to ˜2 × 10 −20 cm² molecule −1 at 330 nm, and thus photolysis may be the major loss process for HO 2 NO 2 in the stratosphere. High resolution infrared absorptivities for HO 2 NO 2 were also determined in the present study since these data are needed for possible quantitative evaluation of HO 2 NO 2 stratospheric concentrations. The infrared cross sections for the 802.7 and 1304.2 cm −1 Q‐branches of HO 2 NO 2 at 0.06 cm −1 resolution are 2.1 × 10 −18 and 1.8 × 10 −18 cm² molecule −1 , respectively.