The absorption of molecular oxygen between 1850 and 2500 Å

Details The absorption of molecular oxygen between 1850 and 2500 Å The absorption of molecular oxygen between 1850 and 2500 Å

Feb 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..127d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 2, pp. 127-139

Physics

21

Scientific paper

Absorption cross-sections for oxygen in the region 1850-2500 Å have been measured. There is a variation with pressure (probably due to the formation of O4). The values obtained by extrapolation to zero pressure vary 6rom 15 × 10-24 cm2 at 1900 Å to 3 × 10-24 cm2 at 2300 Å. The absorption, which is about one million times weaker than that of the Schumann-Runge (S-R) system is the Herzberg continuum corresponding to the forbidden transition 3[Sigma]g- --> 3[Sigma]u+. The absorption cross-sections for this continuum have been calculated for different values of the internuclear distance re; those for re = 1.50 Å agree best with the experimental results. The calculation indicates that the maximum value of the absorption is 15 × 10-24 cm2 at 1870 Å, but this could not be checked experimentally because of the overlying S-R absorption. The dissociation of oxygen in the upper part of the earth's atmosphere, above 80 km, is predominantly due to absorption in the S-R continuum (1850-1350 Å). The present measurements indicate that (as has previously been suggested) absorption in the Herzberg continuum is the principal source of oxygen atoms at levels below 80 km. Thus, this continuum is important in relation to the formation of the ozone layer. At wavelengths near 2100 Å the Herzberg continuum absorbs more of the sun's radiation than does the ozone continuum. Most of this absorption takes place below 25 km. The [latin small letter f with hook]-value of the Herzberg continuum is 3.5 × 10-5.

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