Distorted wave calculation of the electron impact ionization cross section of the ground state of atomic hydrogen

1996 ◽  
Vol 74 (5-6) ◽  
pp. 226-229 ◽  
Author(s):  
Th. Subodh Chandra Singh ◽  
N. Ranjit Singh ◽  
N. C. Deb ◽  
S. C. Mukherjee ◽  
M. Babuyaima ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Ground State ◽  
Atomic Hydrogen ◽  
Impact Ionization ◽  
Wave Model ◽  
Electron Impact Ionization ◽  
Incident Electron Energy ◽  
Distorted Wave ◽  
Wave Calculation

The total cross section and single differential cross section in energy for the electron impact ionization of the ground state of atomic hydrogen were computed using a distorted wave model. The incident electron energy range was 20–250 eV. The present results are compared with existing theoretical and experimental results.

Total cross section for electron-impact ionization from the ground state of atomic hydrogen using the distorted-wave polarized orbital method

1988 ◽  
Vol 66 (5) ◽  
pp. 399-401 ◽  
Author(s):  
K. K. Mukherjee ◽  
P. S. Mazumdar ◽  
S. Brajamani
Keyword(s):  
Total Cross Section ◽  
Electron Impact ◽  
Cross Section ◽  
Ground State ◽  
Atomic Hydrogen ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Orbital Method ◽  
Present Calculation ◽  
Distorted Wave

The total cross-section for electron-impact ionization from the ground state of atomic hydrogen is studied by using the distorted-wave polarized orbital method. In the present calculation we have taken into account the matrix elements arising from the distorted part of the target wave function. The present results are in good agreement with experimental findings.

scholarly journals Deep Minima in the Triply Differential Cross Section for Ionization of Atomic Hydrogen by Electron and Positron Impact

Atoms ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 26
Author(s):  
C. DeMars ◽  
S. Ward ◽  
J. Colgan ◽  
S. Amami ◽  
D. Madison
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Atomic Hydrogen ◽  
Incident Energy ◽  
Transition Matrix ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Transition Matrix Element ◽  
Positron Impact ◽  
Deep Minimum

We investigate ionization of atomic hydrogen by electron- and positron-impact. We apply the Coulomb–Born (CB1) approximation, various modified CB1 approximations, the three body distorted wave (3DW) approximation, and the time-dependent close-coupling (TDCC) method to electron-impact ionization of hydrogen. For electron-impact ionization of hydrogen for an incident energy of approximately 76.45 eV, we obtain a deep minimum in the CB1 triply differential cross section (TDCS). However, the TDCC for 74.45 eV and the 3DW for 74.46 eV gave a dip in the TDCS. For positron-hydrogen ionization (breakup) we apply the CB1 approximation and a modified CB1 approximation. We obtain a deep minimum in the TDCS and a zero in the CB1 transition matrix element for an incident energy of 100 eV with a gun angle of 56.13 ° . Corresponding to a zero in the CB1 transition matrix element, there is a vortex in the velocity field associated with this element. For both electron- and positron-impact ionization of hydrogen the velocity field rotates in the same direction, which is anticlockwise. All calculations are performed for a doubly symmetric geometry; the electron-impact ionization is in-plane and the positron-impact ionization is out-of-plane.

Electron impact ionization of the ground state of singly ionized helium

2000 ◽  
Vol 78 (10) ◽  
pp. 901-906 ◽  
Author(s):  
M Bhattacharya ◽  
N C Deb ◽  
A Z Msezane ◽  
P S Mazumdar
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Differential Cross ◽  
Ground State ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Experimental Results ◽  
Distorted Wave ◽  
Wave Approximation ◽  
34.50 Fa

We calculate the total and single differential cross sections for the electron impact ionization of the ground state of singly ionized helium at various energies in a distorted wave approximation. Present results are compared with existing theoretical and experimental results. PACS Nos.: 34.80.Dp, 34.50.Fa

Electron-Impact Ionization Cross Section of Ions

1969 ◽  
Vol 184 (1) ◽  
pp. 242-244 ◽  
Author(s):  
K. C. Mathur ◽  
A. N. Tripathi ◽  
S. K. Joshi
Keyword(s):  
Electron Impact ◽  
Cross Section ◽  
Ionization Cross Section ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Ionization Cross
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