O₂-triplet emissions in the nightglow

Abstract

Measurements of the volume-emission profiles of Or-triplet emissions have been obtained in conjunction with determinations of atomic-oxygen density under different geophysical conditions. Recent results pertaining to the altitude distribution of the different vibrational levels of 0 2 (~3 2 : ) are discussed, and the excitation mechanism of this state is considered. A critical analysis of some laboratory measurements relevant to 02-triplet emissions is undertaken, and suggestions for further work are made. Also discussed is the relative intensity of the Herzberg-1 and Chamberlain bands.On a effect& des mesures des profils volumiques des Cmissions du spectre triplet de 02. en conjonction avec des determinations de la densite d'oxygene atomique sous diffkrentes conditions gkophysiques. On discute des rksultats recents sur la distribution en altitude des differents niveaux de vibration de O ? ( A~~: ) et on considkre le mecanisme d'excitation de cet Ctat. On entreprend une analyse critique de quelques mesures en laboratoire se rapportant au spectre triplet d'kmission de Oz et on formule des suggestions pour d'autres experiences. On discute aussi l'intensite relative des bandes Herzberg I et Chamberlain.[Traduit par la revue]Can. J Phys. 64, 1587 (1986)

Modelling of low-pressure surface wave discharges in flowing oxygen: II. Power dissipation and gas heating

“…Note that this is the maximum contribution this group of states can provide to gas heating since full relaxation of the excitation energy to the gas translational modes has been assumed. However, the state u ) can be efficiently quenched by O 2 molecules [22]. Moreover, the production of hot atoms (with 0.9 eV kinetic energy) by the 6 eV dissociation channel proceeds in fact via electron excitation of O 2 (A + C + c, v) vibrational levels with energy above the dissociation threshold.…”

Energetic Oxygen in the Upper Atmosphere and the Laboratory

“…This conclusion is radically different from that reached in earlier field measurements, where the fraction of recombination into the total Herzberg I system is typically quoted as 0.03-0.06. 166,177,[272][273][274][275] The choice of these values has been constrained by statistical considerations, 274 and from what has been said, we are not persuaded of the relevance of that approach. Siskind and Sharp 276 performed A 3 Σ u + state modeling and reached a tentative conclusion that the efficiency factor for its production could be as high as 0.23, well above other estimates, but still too low because they used too low an air quenching rate coefficient.…”