Excitation cross sections in a collision between two ground-state hydrogen atoms

2021 ◽  
Author(s):  
SAED J AL ALATWNEH ◽  
Karoly Tokesi
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Hydrogen Atoms ◽  
Excitation Cross Sections

Excitation of the 21S and 23S states of helium atoms by electron and hydrogen atom impact

1977 ◽  
Vol 55 (5) ◽  
pp. 396-402 ◽  
Author(s):  
Madeleine M. Felden ◽  
Marceau A. Felden
Keyword(s):  
Hydrogen Atom ◽  
Cross Sections ◽  
Ground State ◽  
Wave Functions ◽  
The Other ◽  
Helium Atoms ◽  
Atomic Wave ◽  
Excitation Cross Sections ◽  
The One ◽  
S States

Ochkur's approximation is used to analyse the excitation of 21S and 23S levels of helium atoms from the ground state by electron and hydrogen atom impact. Calculations are made with different atomic wave functions. To characterize the 11S and 21S states we use, on the one hand, the wave functions of Byron and Joachain, on the other hand, those of Hylleraas and Marriott and Seaton. For the 11S and 23S states, calculations are made firstly with the wave functions of Byron and Joachain and Morse, Young, and Haurwitz, secondly with those of Shull and Lödwin. Numerical values are tabulated and compared in each case. The discrepancies show the importance of the choice of atomic wave functions in the calculation of the excitation cross sections. Available experimental data and corresponding theoretical values obtained from other theories are plotted and compared with the present results.

scholarly journals Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory

Atoms ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 81
Author(s):  
Oleksandr Marchuk ◽  
Sven Dickheuer ◽  
Stephan Ertmer ◽  
Yuri Krasikov ◽  
Philippe Mertens ◽  
...  
Keyword(s):  
Experimental Data ◽  
Cross Sections ◽  
Ground State ◽  
Low Density ◽  
Hydrogen Atoms ◽  
Time Resolved ◽  
Line Shapes ◽  
Strong Signal ◽  
Balmer Lines ◽  
The Doppler Effect

In this work, we present a new application for the line shapes of emission induced by reflected hydrogen atoms. Optical properties of the solids in contact with the plasma could be effectively measured at the wavelength of Balmer lines: time-resolved measurements of reflectance and polarization properties of mirrors are performed using the wavelength separation of the direct and reflected signals. One uses the Doppler effect of emission of atoms excited by collisions with noble gases, primarily with Ar or with Kr. In spite of a new application of line shapes, the question of the source of the strong signal in the case of Ar exists: the emission observed in the case of the excitation of H or D atoms by Ar exceeds the signal induced by collisions with Kr atoms by a factor of five, and the only available experimental data for the ground state excitation show practically equal cross-sections for both gases in the energy range of 80–200 eV.

scholarly journals Electron capture in slow collisions of O6+ions with atomic hydrogen

2019 ◽  
Vol 625 ◽  
pp. A29
Author(s):  
Xiaohe Lin ◽  
Yong Wu ◽  
J. G. Wang ◽  
Bin Shao ◽  
R. K. Janev
Keyword(s):  
Electron Capture ◽  
Cross Sections ◽  
Ground State ◽  
Atomic Hydrogen ◽  
Theoretical Data ◽  
Rate Coefficients ◽  
Hydrogen Atoms ◽  
Close Coupling ◽  
Radiative Transitions ◽  
Reaction Channels

Aims. Electron capture in collisions of highly charged O6+ions with ground-state hydrogen atoms is a very important process in solar wind X-ray studies.Methods. In the present study, the full quantum-mechanical molecular-orbital close-coupling method is employed to study electron capture reactions in collisions of O6+ion with ground-state atomic hydrogen in the energy region from 10−4keV u−1to 5 keV u−1. The ab initio multi-reference single- and double-excitation configuration interaction (MRD-CI) method is used to calculate the potential and coupling data used in the QMOCC calculations.Results. Total and state-selective cross sections for the dominant and subdominant reaction channels are calculated and compared with the available experimental and theoretical data. The branching ratios for Lithium-like O5+excited ions are used to calculate the contribution of cascade radiative transitions fromn = 5 levels to the population of 4l states. From the calculated cross sections, reaction rate coefficients are obtained for temperatures between 1000 and 1 × 109K and compared with other calculations.

Excitation Cross Sections of Alkali-Metal Atoms Colliding with Slow Electrons

1973 ◽  
Vol 51 (16) ◽  
pp. 1709-1714 ◽  
Author(s):  
Madeleine M. Felden ◽  
Marceau A. Felden
Keyword(s):  
Alkali Metal ◽  
Cross Section ◽  
Cross Sections ◽  
Ground State ◽  
Alkali Metals ◽  
Tabular Form ◽  
Metal Atoms ◽  
Excitation Cross Sections ◽  
Experimental Values ◽  
Slow Electrons

A previously developed model is extended to the case of excitation of the alkali metals (Li, Na, K, Rb, Cs) by electron impact. The results of the cross-section calculations to transitions n0s → n0p (n0s being the ground state) are compared with experimental values. Numerical results concerning some other transitions are given in tabular form.

Measurement of electron-impact excitation cross sections out of metastable levels of argon and comparison with ground-state excitation

1999 ◽  
Vol 59 (4) ◽  
pp. 2749-2763 ◽  
Author(s):  
John B. Boffard ◽  
Garrett A. Piech ◽  
Mark F. Gehrke ◽  
L. W. Anderson ◽  
Chun C. Lin
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Ground State ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Excitation Cross Sections
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