O2 (a1Δg,v=0) and O2(b1Σg+, v=0) Products Following O2(A 3 Σ u+) Excitation and O2 Collisions

Details O2 (a1Δg,v=0) and O2(b1Σg+, v=0) Products Following O2(A 3 Σ u+) Excitation and O2 Collisions O2 (a1Δg,v=0) and O2(b1Σg+, v=0) Products Following O2(A 3 Σ u+) Excitation and O2 Collisions

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa22a0717c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA22A-0717

Physics

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties

Scientific paper

Excitation of the Herzberg states of O2 close to the dissociation limit and the resulting flow of energy down the various O2 manifolds is a surrogate for the 3-body atom recombination process. Previous SRI studies have shown that laser excitation of the O2( A3Σ u+) state to the v=7,8 levels followed by O2 collisions results in production of O2(b1Σg+, v=10-15) and O2(a1Δg,v=15-20), along with prompt production of O2 molecules in the v=0 levels of the b1Σg+ and a1Δg states.(1) The transient vibrationally-excited populations have been probed with resonance-enhanced multiphoton ionization (REMPI). In this work we perform quantitative studies of the two v=0 populations, to evaluate their yields in the levels from which they radiate in the atmosphere. Yields are determined by comparison with products from an ozone/oxygen system, and with this information it will ultimately be possible to convert the atmospheric v=0 emission intensities to O-atom densities. 1) K.S. Kalogerakis et al., EOS Transactions, 81, F944 (2000). We gratefully acknowledge support from the NASA Planetary Atmospheres program.

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