J/A+A/633/A39 Calculated cross sections of photolysis (Valiev+, 2020)
Photolysis of diatomic molecules as a source of atoms in planetary exospheres.
Valiev R.R., Berezhnoy A.A., Gritsenko I.S., Merzlikin B.S.,
Cherepanov V.N., Kurten T., Woehler C.
<Astron. Astrophys. 633, A39 (2020)>
=2020A&A...633..A39V (SIMBAD/NED BibCode)
ADC_Keywords: Atomic physics
Keywords: meteorites - meteors - meteoroids - stars: kinematics and dynamics -
molecular processes - molecular data - radiation mechanisms: general -
ultraviolet: planetary systems
Abstract:
We calculated the cross sections of photolysis of OH, LiO, NaO, KO,
HCl, LiCl, NaCl, KCl, HF, LiF, NaF, and KF molecules using quantum
chemistry methods. The maximal values for photolysis cross sections of
alkali metal monoxides are on the order of 10-18cm2. The lifetimes
of photolysis for quiet Sun at 1 astronomical unit are estimated as
2.0x105, 28, 5, 14, 2.1x105, 225, 42, 52, 2x106, 35400, 486, and
30400s for OH, LiO, NaO, KO, HCl, LiCl, NaCl, KCl, HF, LiF, NaF, and
KF, respectively. We performed a comparison between values of
photolysis lifetimes obtained in this work and in previous studies.
Based on such a comparison, our estimations of photolysis lifetimes of
OH, HCl, and HF have an accuracy of about a factor of 2. We determined
typical kinetic energies of main peaks of photolysis-generated metal
atoms. Impact-produced LiO, NaO, KO, NaCl, and KCl molecules are
destroyed in the lunar and Hermean exospheres almost completely during
the first ballistic flight, while other considered molecules are more
stable against destruction by photolysis.
Description:
The calculated cross sections of photolysis of OH, LiO, NaO, KO, HCl,
LiCl, NaCl, KCl, HF, LiF, NaF, and KF molecules using
quantum chemistry methods.
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Acknowledgements:
Rashid Valiev, valievrashid(at)mail.ru,
Tomsk State University, 36, Lenin Avenue, 634050 Tomsk, Russia
(End) Patricia Vannier [CDS] 06-Dec-2019