Ionization mechanisms in CRRES chemical releases 2. Strontium photoionization and <formula>Ba+/Sr+ collisional ionization cross-section calculations

Details Ionization mechanisms in CRRES chemical releases 2. Strontium photoionization and <formula>Ba+/Sr+ collisional ionization cross-section calculations Ionization mechanisms in CRRES chemical releases 2. Strontium photoionization and <formula>Ba+/Sr+ collisional ionization cross-section calculations

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103..447w&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A1, p. 447-456

Physics

Plasma Physics

3

Ionosphere: Active Experiments, Space Plasma Physics: Active Perturbation Experiments, Space Plasma Physics: Ionization Processes, Space Plasma Physics: Neutral Particles

Scientific paper

Two particular collision processes involving electron transfer are investigated that may have impact on the analyses of ion flux data obtained in the CRRES G-1 and G-11b, upper atmospheric chemical release experiments. Ion pair production (σIP) and charge exchange ionization (σCE) cross sections are calculated as a function of collision energy for reactions between Ba/Sr atoms and O atoms and O+ ions, respectively, using two-state approximation theories. The cross sections for each process are calculated for both the ground and metastable states of the metal atoms. At a collision energy of 9.5 eV attained in the G-1 and G-11b CRRES releases, the calculations indicate that σIP=1.3×10-16cm2 and σCE=2-6×10-16cm2 for reactions involving Ba(1S20). The cross sections for the analogous Sr reactions are approximately 1.2×10-16cm2 and 2-8×10-17cm2, respectively. In addition, Sr photoionization from 3PJ metastable states is investigated. Although we calculate a 29-s photoionization time constant from these states, a kinetic analysis indicates the metastable states cannot accumulate an appreciable equilibrium population in full solar exposure. Thus photoionization from the Sr 3PJ levels does not significantly contribute to the total ion inventory.

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