Collisional vibrational quenching of O2(+) (v) and other molecular ions in planetary atmospheres

Details Collisional vibrational quenching of O2(+) (v) and other molecular ions in planetary atmospheres Collisional vibrational quenching of O2(+) (v) and other molecular ions in planetary atmospheres

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983p%26ss...31..483b&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 31, April 1983, p. 483-487. Research supported by the U.S. Defense Nuclear Ag

Physics

Atomic Physics

19

Atmospheric Composition, Carbon Dioxide Concentration, Molecular Collisions, Oxygen Ions, Planetary Atmospheres, Collision Rates, Earth Atmosphere, Molecular Relaxation, Neutral Gases, Quenching (Atomic Physics), Triatomic Molecules, Vibrational Spectra

Scientific paper

Results recently obtained by a new technique on the vibrational quenching of O2(+) (v) that are relevant to the earth's atmosphere and the atmospheres of the CO2-dominated planets are presented. These measurements and other qualitative observations concerning triatomic ions are shown to support theoretical arguments predicting lower limits for vibrational quenching of most molecular ions in collisions with most neutrals and, consequently, upper limits on their lifetimes. The rates for the quenching of O2(+) (v = 1) at 300 K by O2, N2, Ar, CO2, H2, and CH4 are 3(-10), 2(-12), 1(-12), 1(-10), 2.5(-12), and 6(-10) cu cm/s. The quenching is found to be slightly faster for O2(+) (v = 2). The triatomic ions CO2(+), NO2(+), N2O(+), SO2(+), and H2O(+) are all vibrationally deexcited with an efficiency exceeding 10 to the -3rd in Ar or Ne collisions. It is predicted that vibrational quenching in planetary atmospheres will generally be efficient, with k greater than 1(-12) cu cm/s for almost all ion and neutral gas pairs.

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