Laboratory Measurement of O3(v) + O Vibrational Energy Transfer

Details Laboratory Measurement of O3(v) + O Vibrational Energy Transfer Laboratory Measurement of O3(v) + O Vibrational Energy Transfer

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0281c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0281

Other

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0340 Middle Atmosphere: Composition And Chemistry, 0342 Middle Atmosphere: Energy Deposition (3334)

Scientific paper

Photochemical reactions involving O3 play a key role in determining the thermal and radiative structure of the upper mesosphere/lower thermosphere. Emission detected in NASA's TIMED/SABER 9.6-μm channel is dominated by the O3(ν3) asymmetric stretch mode, including hot band and combination band emission arising from vibrationally-excited O3(v) populated by O + O2 + M three-body recombination. Rate coefficients kM(O3) for the relaxation of O3(v) by O2, N2, and O must be known to confidently model the O3 photochemistry in this region. Measurements of O3( v) quenching by O2 and N2 have been performed by several groups, including the temperature dependence. On the other hand, rate coefficients kO(O3) for quenching of O3(ν2,ν3) by O were only reported in a single published paper some 30 years ago. Those measurements were performed at room temperature, and yielded rate coefficients with factor-of-two precision. The data suggest that quenching of O3(v) by O could make a significant contribution especially at higher altitudes, motivating an updated measurement. The goal of the present work is to measure the quenching of several excited O3(v) levels by O using a temperature-jump/transient diode laser absorption experiment similar to the ongoing CO2(ν2)-O study. Ultimately a variable-temperature reaction cell will be used to measure temperature-dependent O3(v)-O relaxation rates for the first time.

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