In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 92, No. D6 ( 1987-06-20), p. 6642-6652
Abstract:
A large discrepancy exists among recent estimates of the primary quantum efficiencies (ϕ 1 ) of nitrogen dioxide photodecomposition, NO 2 + h ν → NO + O( 3 P ), in the wavelength range from 374 to 396 nm. To resolve this problem, quantum yields of formation of NO, O 2 , and NO 2 loss have been measured for NO 2 vapor at low pressures (0.13–0.30 torr) irradiated at selected wavelengths (334.1–404.3 nm) and temperatures (273–370 K). From these data, estimates of ϕ 1 were derived which confirm the previous findings of Jones and Bayes (1973 b ): ϕ 1 increases rapidly from near zero at 424 nm to near unity for excitation at λ 〈 394 nm. The temperature and wavelength dependences of ϕ 1 appear to be in qualitative accord with the simple theory of Pitts et al. (1964) that the energy deficiency for photodissociation of NO 2 excited at λ 〉 397.9 nm (λ diss ) is made up in large part from the rotational and vibrational energy of the NO 2 molecules. Recommended values for ϕ 1 based upon a review of these data and estimates made over a period of 58 years, are given as a function of wavelength.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JD092iD06p06642
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1987
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