Vibrational relaxation of CO2(ν2) by O(3P) in the 142–490 K temperature range

Details Vibrational relaxation of CO2(ν2) by O(3P) in the 142–490 K temperature range Vibrational relaxation of CO2(ν2) by O(3P) in the 142–490 K temperature range

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012jgra..11704310c&link_type=abstract

Journal of Geophysical Research, Volume 117, Issue A4, CiteID A04310

Physics

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Middle Atmosphere: Energy Deposition (3334), Atmospheric Composition And Structure: Pressure, Density, And Temperature, Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369)

Scientific paper

Laboratory measurements of the quenching of CO2(ν2) by O atoms are presented over the 142–490 K temperature range relevant to the 75–120 km altitude region of the terrestrial atmosphere. The primary cooling mechanism in this region occurs when CO2 is efficiently excited through collisions with ambient O atoms, populating the bending vibrational (ν2) modes. A significant fraction of the vibrationally excited CO2 relaxes through spontaneous 15-μm emission that escapes into space, thereby removing kinetic energy from this region of the atmosphere and generating a local cooling effect. The rate coefficient for the vibrational relaxation of CO2(ν2) by O atoms, kO(ν2), is measured using transient diode laser absorption spectroscopy. A slight negative temperature dependence is observed for kO(ν2), with values ranging from 2.7 (±0.4) × 10‑12 cm3 s‑1 at 142 K to 1.3 (±0.2) × 10‑12 cm3 s‑1 at 490 K.

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