Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa72a0518s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA72A-0518
Astronomy and Astrophysics
Astronomy
0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0355 Thermosphere: Composition And Chemistry
Scientific paper
Astronomical sky spectra obtained at the W. M. Keck Observatory on Mauna Kea have greatly increased our knowledge of the spectroscopy of the O2 molecule. In the past, high-resolution studies on O2 have been largely limited to absorption measurements from the ground state, and those electronic states and vibrational levels that can not be accessed in that way have essentially not been studied. We will review the new nightglow data in this presentation. Included are the following cases, where measurements are made with an instrumental resolution of about 40,000: 1) O2(X3\Sigmag^-), v = 0-15, J = 0-25 (much higher for v = 0,1) 2) O2(a1$Δg), v = 1-10, J = 2-25 3) O2(b1\Sigmag^{+}), v = 0-15, J = 0-25 (much higher for v = 0,1) 4) O2(A'3$Δu,[Ω =3]), v = 2-10, J = 2-25 We also find it possible to carry out spectroscopy on the b-X 0-0 band from the ground, the atmosphere being relatively transparent to high-J lines originating in the ionosphere. In addition, a new O2 emission system has been discovered, the c1Σ u- - b1Σg+ bands. There has been a synergistic effect of the existence of such data on laboratory studies, where information is now available for both the a1Δg and b1Σg+ states in the v = 10-25 range, not only in terms of spectroscopy, but also for removal rate coefficients and reaction pathways.1 We are grateful to the various astronomers who have shared their Keck sky spectra with us. This study has been supported by the NSF Aeronomy program. 1K S Kalogerakis, A Totth, P C Cosby, T G Slanger, and R A Copeland, "Laboratory studies of the production of highly vibrationally excited O2(a1Δg and b1Σ g+) from O2(A3\Sigmau+) relaxation," Eos Trans. AGU 81, F944 (2000).
Cosby Philip C.
Huestis David L.
Slanger Tom G.
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