Collisions of Lithium Atoms in Ground State. Complex Spin-Exchange Cross Sections

2021 ◽  
Author(s):  
V. A. Kartoshkin
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Spin Exchange ◽  
Complex Spin

scholarly journals Столкновения с участием поляризованных щелочных атомов цезия и лития

2020 ◽  
Vol 128 (4) ◽  
pp. 483
Author(s):  
В.А. Картошкин
Keyword(s):  
Magnetic Resonance ◽  
Frequency Shift ◽  
Temperature Dependence ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Resonance Line ◽  
Spin Exchange ◽  
Interaction Potentials ◽  
The Real

The cross section and frequency shift of the magnetic resonance line for the spin exchange are calculated for a collision of lithium and cesium atoms in the ground state. The calculation was carried out on the basis of data on the singlet (X1Sigma+) and triplet (a3Sigma+) interaction potentials of the 7Li133Cs dimer. The transfer from the energy to the temperature dependence of the real and imaginary parts of the complex cross sections for a spin exchange allows us to obtain information both the broadening of the magnetic resonance line of the atoms under study and the frequency shift of the magnetic resonance upon their collision.

scholarly journals Спин-обменные столкновения в системе K-Li

2019 ◽  
Vol 127 (10) ◽  
pp. 639
Author(s):  
В.А. Картошкин
Keyword(s):  
Magnetic Resonance ◽  
Resonance Frequency ◽  
Frequency Shift ◽  
Cross Sections ◽  
Spin Exchange ◽  
Resonance Frequency Shift ◽  
Magnetic Resonance Frequency ◽  
Complex Spin ◽  
Exchange Cross Section ◽  
First Time

AbstractSpin-exchange cross sections and the magnetic-resonance frequency shift in collision of lithium and potassium atoms in the ground state have been calculated for the first time. The cross sections are calculated based on the data on the singlet ( $$X{}^{1}{{\Sigma }^{ + }}$$ ) and triplet ( $$a{}^{3}{{\Sigma }^{ + }}$$ ) interaction potentials of ^39K^7Li dimer. A passage from the energy dependences to the temperature ones of the real and imaginary parts of the complex spin-exchange cross section yields information about both the broadening of the magnetic resonance line of the atoms under study and the magnetic-resonance frequency shift in their collision.

scholarly journals On the Appearance of a Cooper Minimum in the Photoionization Cross Sections of the Plasma-Embedded Li Atom

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
Satyabrata Sahoo ◽  
Y. K. Ho
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Debye Screening Length ◽  
Debye Screening ◽  
Screening Length ◽  
Screening Effect ◽  
Plasma Environment ◽  
Plasma Screening ◽  
Debye Plasma

The plasma screening effect is found to uncover a Cooper minimum in the photoionization cross sections from the ground state of the Li atom embedded in Debye plasma environment. The variation of the location of this minimum with Debye screening length is discussed and analyzed in terms of the instability of the ground state.

Dipole oscillator strength distributions and properties for SO2, CS2, and OCS

1985 ◽  
Vol 63 (3) ◽  
pp. 417-427 ◽  
Author(s):  
Ashok Kumar ◽  
William J. Meath
Keyword(s):  
Oscillator Strength ◽  
Cross Sections ◽  
Ground State ◽  
Strength Properties ◽  
Oscillator Strengths ◽  
Sum Rule ◽  
Strength Data ◽  
Dilute Gases ◽  
Dipole Oscillator ◽  
Strength Distributions

Dipole oscillator strength distributions have been constructed and used to evaluate integrated oscillator strengths, and a variety of dipole oscillator strength properties, for ground state SO2, CS2, and OCS. Each distribution has been constructed by using experimental and theoretical photoabsorption cross sections and by subjecting the resulting dipole oscillator strength data to constraints provided by the Thomas–Reiche–Kuhn sum rule and molar refractivity data for the relevant dilute gases. The discussion includes graphical presentations of how various spectral regions of the dipole oscillator strength distributions contribute to the more important dipole properties.

scholarly journals Production of C4+ (2s2p 3,1P) hollow states in collisions of 6-18 MeV C4+ (1s2, 1s2s 3S) mixed-state beams with gas targets

2019 ◽  
Vol 26 ◽  
pp. 133
Author(s):  
A. Laoutaris ◽  
I. Madesis ◽  
E. P. Benis ◽  
T. J. M. Zouros
Keyword(s):  
Ground State ◽  
Collision Energy ◽  
Spin Exchange ◽  
Electron Excitation ◽  
Target Species ◽  
Zero Degree ◽  
Excitation Mechanisms ◽  
Gas Targets ◽  
Ar Gas

Normalized electron yields of the formation of 2s2p 3,1P states from the metastable states 1s2s 3,1S and from the ground state 1s21S were obtained in 6-18MeV C4+ collisions with H2, He, Ne and Ar gas targets. The method of zero-degree Auger projectile spectroscopy was used to detect electrons emitted in the Auger decay C4+ (2s2p 3,1P) → C5+ (1s) + e-with high resolution. These states are of particular importance in the detailed study of fundamental excitation mechanisms, i.e. electron-nucleus excitation, electron-electron excitation and electron-electron excitation with spin exchange. Currently, the role of the above mechanisms in the production of the 2s2p 3,1P states is investigated utilizing variable 1s2s 3S metastable fraction beams as a function of collision energy and target species. Our latest results are presented.

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