Photolysis of diatomic molecules as a source of atoms in planetary exospheres

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http://hdl.handle.net/10138/310369

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Valiev , R R , Berezhnoy , A A , Gritsenko , I S , Merzlikin , B S , Cherepanov , V N , Kurten , T & Wöhler , C 2020 , ' Photolysis of diatomic molecules as a source of atoms in planetary exospheres ' , Astronomy & Astrophysics , vol. 633 , 39 . https://doi.org/10.1051/0004-6361/201936230

Title: Photolysis of diatomic molecules as a source of atoms in planetary exospheres
Author: Valiev, R. R.; Berezhnoy, A. A.; Gritsenko, I. S.; Merzlikin, B. S.; Cherepanov, Viktor N.; Kurten, Theo; Wöhler, Chrisitan
Contributor: University of Helsinki, Department of Chemistry
University of Helsinki, Department of Chemistry
Date: 2020-01-08
Language: eng
Number of pages: 12
Belongs to series: Astronomy & Astrophysics
ISSN: 0004-6361
URI: http://hdl.handle.net/10138/310369
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(-18) cm(2). The lifetimes of photolysis for quiet Sun at 1 astronomical unit are estimated as 2.0 x 10(5), 28, 5, 14, 2.1 x 10(5), 225, 42, 52, 2 x 10(6), 35 400, 486, and 30 400 s 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.
Subject: 116 Chemical sciences
meteorites, meteors, meteoroids
stars: kinematics and dynamics
molecular processes
molecular data
sradiation mechanisms: general
ultraviolet: planetary systems
FRANCK-CONDON
PHOTODISSOCIATION PROCESSES
ELECTRONIC STATES
CROSS-SECTIONS
IMPACT EVENTS
LINE LISTS
AB-INITIO
SODIUM
ALKALI
CHEMISTRY
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