Laboratory Studies of CO2(ν 2)-O Vibrational Energy Transfer

Details Laboratory Studies of CO2(ν 2)-O Vibrational Energy Transfer Laboratory Studies of CO2(ν 2)-O Vibrational Energy Transfer

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa41b0443c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA41B-0443

Physics

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0342 Middle Atmosphere: Energy Deposition

Scientific paper

For altitudes above about 80 km, oxygen molecules are increasingly dissociated by solar VUV absorption, and O atoms, together with N2, become a principal constituent of the atmosphere. Through collisions with the ambient O atoms, the ground vibrational state of CO2 is efficiently excited to its lowest excited vibrational state, with one quantum of energy in the ν 2 bending mode. In the near-space environment, a sizable fraction of this population relaxes via 15-μ spontaneous IR emission, which effectively converts ambient kinetic energy into radiative energy that passes into space. This process is the principal upper atmospheric cooling mechanism in the 75-120 km altitude range. Despite the importance of this mechanism, current estimates of the CO2(ν 2)-O vibrational relaxation rate constant vary over a factor of six, with the laboratory measurements clustering in the 1-1.5 x 10-12 cm3s-1 range, and the aeronomical estimates in the 3-6 x 10-12 cm3s-1 range. We are currently pursuing vibrational relaxation measurements on the CO2(ν 2)-O system in the laboratory, using the temperature jump method together with transient diode laser absorption spectroscopy detection of the CO2 vibrational level populations. We will present the current state of progress of the experimental effort, as well as possible future directions.

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