Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33a0253m&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA33A-0253
Physics
0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0340 Middle Atmosphere: Composition And Chemistry, 0342 Middle Atmosphere: Energy Deposition (3334)
Scientific paper
The \it c-state of O2 is one of the electronic states produced by three-body recombination of oxygen atoms in both the atmosphere of Earth and Venus. On the Earth the emission is from high vibrational levels while on Venus the bulk of the emission comes from the υ = 0 level. Recently, Slanger et al.^1 have suggested that the predominant emitter in the visible nightglow of Venus and presumably Mars - the υ = 0 level of the O2(\it c^1Σ_u^-) state - could react with CO to reform CO2 in a scheme that substitutes O + O over O + CO as a key recombination step. In this work, we study the high vibrational levels of the \it c-state to look for evidence of reaction with CO and determine rate coefficients for atmospherically relevant colliders near 250 K. Measurements have been carried out on the collisional removal of O2 in vibrationally excited levels (υ = 9-11) of the \it c^1Σ_u^- state with the colliders - O2, CO, CO2, N2. We use a two-laser state-specific multiphoton ionization method. In the experiment the output of the first laser excites the ground state O2 molecules to the \it c^1Σ_u^- state and the light from the second laser monitors either the excited vibrational level or a neighboring level. Rate coefficients are quite large in all cases, generally exceeding 10^-^1^1 cm3s^-^1, but preliminary measurements with CO indicate that a substantial fraction of the O2(\it c,υ) removal rate is associated with cascading to lower vibrational levels rather than reaction. Support for this work comes from the NASA Planetary Atmospheres Program, as well as the National Science Foundation Research Experiences for Undergraduates Program. ^1 Slanger, T. G.; Huestis, D. L.; Cosby, P.C.; Chanover, N. J.; Bida, T. A. Icarus 2006, 182, 1.
Bolin E.
Copeland Richard A.
Mullen C.
Slanger Tom G.
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