Temperature Dependence of O2(b1Σ ^+g, v = 0 and 1) Relative Yield in O(1D) + O2 Energy Transfer

Details Temperature Dependence of O2(b1Σ ^+g, v = 0 and 1) Relative Yield in O(1D) + O2 Energy Transfer Temperature Dependence of O2(b1Σ ^+g, v = 0 and 1) Relative Yield in O(1D) + O2 Energy Transfer

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51b1951k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA51B-1951

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0317] Atmospheric Composition And Structure / Chemical Kinetic And Photochemical Properties, [0358] Atmospheric Composition And Structure / Thermosphere: Energy Deposition, [0399] Atmospheric Composition And Structure / General Or Miscellaneous

Scientific paper

Energy transfer from excited O(1D) atoms to ground-state O2(X3Σ ^-g) leads to production of O2 in the first two vibrational levels of the O2 (b1Σ ^+g) state: O(1D) + O2 -> O(3P) + O2(b1Σ ^+g, v = 0, 1). Subsequent radiative decay of O2(b1Σ ^+g, v = 0, 1) to the ground state results in the Atmospheric Band emission, a prominent feature of the terrestrial airglow. The relative yield for production of O2(b1Σ ^+g, v = 0 and 1) in the above process, k1/k0, is an important parameter in modeling of the observed Atmospheric Band emission intensities. Recent measurements at room temperature have shown that production of O2(b1Σ ^+g, v = 1) dominates that of O2(b1Σ ^+g, v = 0), with k1/k0 having a value of approximately 3.5 [1]. In the laboratory experiments, the output of a pulsed fluorine laser at 157 nm is used to photodissociate molecular oxygen in an O2/N2 mixture flowing through a heated gas cell. Photodissociation of O2 produces a ground-state O(3P) atom and an excited O(1D) atom. O(1D) rapidly transfers energy to the remaining O2 to produce O2(b1Σ ^+g, v = 0, 1). The populations of O2(b1Σ ^+g, v = 0 and 1) are monitored by observing emissions in the O2(b--X) 0--0 and 1--0 bands at 762 and 688 nm, respectively. The value of k1/k0 is extracted from the time-dependent O2(b1Σ ^+g, v = 0 and 1) fluorescence signals using computer simulations. We will present measurements on the temperature dependence of k1/k0 and discuss their atmospheric significance. This work was supported by the US National Science Foundation (NSF) Aeronomy Program under grant AGS-0937317. The fluorine laser was purchased under grant ATM-0216583 from the NSF Major Research Instrumentation Program. S. Raj and K. M. Campbell participated in a Research Experiences for Undergraduates (REU) site, co-funded by the Division of Physics of the NSF and the Department of Defense in partnership with the NSF REU program under grant PHY-1002892. [1] K. S. Kalogerakis, D. A. Pejaković, R. A. Copeland, T. G. Slanger (2005), Relative Yield of O2(b1Σ ^+g, v = 0 and 1) in O(1D) + O2 Collisions, Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract SA11A-0220.

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