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Photodissociation quantum yields for the NO 3 free radical
Author(s) -
Magnotta Frank,
Johnston Harold S.
Publication year - 1980
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/gl007i010p00769
Subject(s) - photodissociation , photochemistry , quantum yield , ultraviolet , torr , wavelength , fluorescence , analytical chemistry (journal) , resonance fluorescence , radical , materials science , chemistry , optics , physics , optoelectronics , organic chemistry , chromatography , thermodynamics
The nitrate free radical was photolyzed by a pulsed tunable dye laser between 470 and 685 nm, at 296 K, and in the presence of 10 torr N 2 . The two product channels, NO + O 2 and NO 2 + O, were measured by resonance fluorescence of NO or of O. Absolute calibration of the method was achieved by in situ ultraviolet photolysis of NO 2 , which yields both NO and O. With these data on photochemical yields, the photolysis coefficients for the two product channels at the surface of the earth with an overhead sun over wavelengths 470‐700 nm are calculated to be j 1 (NO + O 2 ) = 0.022 ± 0.007 s −1 j 2 (NO 2 + O) = 0.18 ± 0.06 s −1