Perturbation and the effects on the transition intensity and the line shape studied on alkali metal diatomic molecules

1990 ◽  
Vol 67 (1-2) ◽  
pp. 73-89
Author(s):  
Hajime Katô ◽  
Mitsuhiko Otani ◽  
Masaaki Baba
Keyword(s):  
Alkali Metal ◽  
Line Shape ◽  
Diatomic Molecules ◽  
Transition Intensity

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.

Shortcuts for understanding rovibronic spectroscopy of ultracold alkali metal diatomic molecules

2012 ◽  
Vol 110 (15-16) ◽  
pp. 1739-1755 ◽  
Author(s):  
William C. Stwalley ◽  
Michael Bellos ◽  
Ryan Carollo ◽  
Jayita Banerjee ◽  
Matthew Bermudez
Keyword(s):  
Alkali Metal ◽  
Diatomic Molecules

scholarly journals Complexes formed in collisions between ultracold alkali-metal diatomic molecules and atoms

2021 ◽  
Author(s):  
Matthew David Frye ◽  
Jeremy M Hutson
Keyword(s):  
Alkali Metal ◽  
Spin Exchange ◽  
Diatomic Molecules ◽  
Peak Height ◽  
Nuclear Spins ◽  
Vibrational States ◽  
Ultracold Collisions ◽  
Fermi Contact ◽  
Near Degeneracy ◽  
Fine And Hyperfine Structure

Abstract We explore the properties of 3-atom complexes of alkali-metal diatomic molecules with alkali-metal atoms, which may be formed in ultracold collisions. We estimate the densities of vibrational states at the energy of atom-diatom collisions, and find values ranging from 3.9 to 350 K$^{-1}$. However, this density does not account for electronic near-degeneracy or electron and nuclear spins. We consider the fine and hyperfine structure expected for such complexes. The Fermi contact interaction between electron and nuclear spins can cause spin exchange between atomic and molecular spins. It can drive inelastic collisions, with resonances of three distinct types, each with a characteristic width and peak height in the inelastic rate coefficient. Some of these resonances are broad enough to overlap and produce a background loss rate that is approximately proportional to the number of outgoing inelastic channels. Spin exchange can increase the density of states from which laser-induced loss may occur.

scholarly journals On the line shape of the total rovibronic absorption in laser-dressed diatomic molecules

2021 ◽  
Author(s):  
Gabor Halász ◽  
Tamás Szidarovszky ◽  
Agnes Vibok
Keyword(s):  
High Resolution ◽  
Line Shape ◽  
Probability Function ◽  
Numerical Models ◽  
Diatomic Molecules ◽  
Emission Spectra ◽  
Basis Functions ◽  
Total Absorption ◽  
Absorption Probability ◽  
Intensity Laser

Recently, the rovibronic absorption and emission spectra of diatomic molecules dressed by medium-intensity laser fields have been discussed. By computing the total absorption probability as a function of dressing wavelength an asymmetric line shape has been obtained strongly resembling to the well-known Fano line shape. Applying two-state analytical and three-state numerical models the shape of the total absorption probability function is explained. Further confirmation of the model based results is provided by high resolution accurate numerical computations using large number of basis functions.

Relations between electronegativity and potential energy in the alkali metal molecules

1968 ◽  
Vol 46 (22) ◽  
pp. 2563-2565 ◽  
Author(s):  
S. Szöke ◽  
E. Baitz
Keyword(s):  
Alkali Metal ◽  
Potential Energy ◽  
Energy Function ◽  
Diatomic Molecules ◽  
Potential Energy Function ◽  
Spectroscopic Constants ◽  
Chemical Physics ◽  
Energy Functions ◽  
Spectroscopic Parameters ◽  
Potential Energy Functions

Potential energy functions can be constructed by the aid of parameters other than spectroscopic constants to render the possibility of linking different areas in chemical physics. By using a formula connecting force constants of diatomic molecules and bonds in polyatomics, a potential energy function can be obtained by replacing some of the spectroscopic parameters by expressions based on the use of electronegativities.

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