Vibrational Distributions in the A3Σ +u and A'3Δu States of O2 in the MLT Nightglow: Results from Astronomical Sky Spectra

Details Vibrational Distributions in the A3Σ +u and A'3Δu States of O2 in the MLT Nightglow: Results from Astronomical Sky Spectra Vibrational Distributions in the A3Σ +u and A'3Δu States of O2 in the MLT Nightglow: Results from Astronomical Sky Spectra

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa12a1073w&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA12A-1073

Astronomy and Astrophysics

Astronomy

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 0358 Thermosphere: Energy Deposition

Scientific paper

Astronomical sky spectra from the Keck I telescope on Mauna Kea have been used to obtain vibrational distributions in the O2A3Σ +u and O2A'3Δ u states from rotationally-resolved Herzberg I A-X and Chamberlain A'-a band emissions in the terrestrial nightglow. The A3Σ +u distribution is similar to that presented in earlier publications, with the exception that there is significant population in the previously undiscerned v = 0 level. For the A'3Δ u state, the vibrational distribution is essentially the same as that of the A3Σ +u state when comparison is made in terms of the level energies. The intensity ratio at the peak of the distribution favors the A-X emission by a factor of four, as previously shown, and is probably a measure of radiative efficiency. The peaks in both population distributions are about 0.25 eV below the O(3P) + O(3P) dissociation limit, and reflect both the pathways by which the nascent O2* molecule is generated and stabilized, and the collisional loss rates.

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