Quantum and semiclassical analysis of spin-change cross sections for the alkali diatomic molecules

1990 ◽  
Vol 23 (18) ◽  
pp. 3113-3122 ◽  
Author(s):  
J P Braga ◽  
A J C Varandas
Keyword(s):  
Cross Sections ◽  
Diatomic Molecules ◽  
Semiclassical Analysis ◽  
Alkali Diatomic Molecules

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

2020 ◽  
Vol 633 ◽  
pp. A39 ◽  
Author(s):  
R. R. Valiev ◽  
A. A. Berezhnoy ◽  
I. S. Gritsenko ◽  
B. S. Merzlikin ◽  
V. N. Cherepanov ◽  
...  
Keyword(s):  
Alkali Metal ◽  
Quantum Chemistry ◽  
Cross Sections ◽  
Diatomic Molecules ◽  
Astronomical Unit ◽  
Quiet Sun ◽  
Metal Atoms ◽  
The Cross ◽  
Planetary Exospheres

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 cm2. The lifetimes of photolysis for quiet Sun at 1 astronomical unit are estimated as 2.0 × 105, 28, 5, 14, 2.1 × 105, 225, 42, 52, 2 × 106, 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.

Thermal scattering of atoms by homonuclear diatomic molecules

1963 ◽  
Vol 274 (1359) ◽  
pp. 427-442 ◽  
Keyword(s):  
Cross Sections ◽  
Diatomic Molecules ◽  
Rotational Quantum Number ◽  
Formal Theory ◽  
Rotational Transition ◽  
Rigid Rotator ◽  
Total Cross Sections ◽  
Total Scattering Cross Section ◽  
Scattering Of Atoms ◽  
Homonuclear Diatomic Molecules

The formal theory of scattering by a rigid rotator is applied to the problem of the rotational excitation and elastic scattering of homonuclear diatomic molecules by atoms. A statistical theory is employed to analyze the effects of the strong coupling which occurs between the different scattering channels. According to this theory the Massey-Mohr formula provides a good approximation to the total scattering cross-section, an upper limit of ½ holds for the ratio of inelastic to total cross-sections and the probability of a rotational transition does not depend very sensitively on the corresponding change in the rotational quantum number. Numerical results are presented for the collision of argon and nitrogen at room temperature.

The Viscomagnetic Effect in Mixtures

1973 ◽  
Vol 28 (6) ◽  
pp. 849-861 ◽  
Author(s):  
A. L. J. Burgmans ◽  
P. G. van Ditzhuyzen ◽  
H. F. P. Knaap
Keyword(s):  
Cross Sections ◽  
Diatomic Molecules ◽  
Noble Gas ◽  
Simple Interaction

A study is presented of the viscomagnetic effect in binar mixtures consisting of diatomics and noble gas atoms. The following systems have been investigated: HD -He, HD -Ne, HD-Ar and N2 -He, N2-Ne, N2-Ar. The purpose of this research is to obtain effective cross sections for the relatively simple interaction between monatomic and diatomic molecules. Various effective cross sections are presented.

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