Cross sections for the ionisation of helium by electron impact in a distorted-wave model

1979 ◽  
Vol 12 (7) ◽  
pp. 1267-1278 ◽  
Author(s):  
B H Bransden ◽  
J J Smith ◽  
K H Winters
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Wave Model ◽  
Distorted Wave

Differential cross sections and angular correlation parameters for the excitation of the n = 3 levels of helium by electron impact

1977 ◽  
Vol 55 (12) ◽  
pp. 1074-1082 ◽  
Author(s):  
K. H. Winters ◽  
M. Issa ◽  
B. H. Bransden
Keyword(s):  
Experimental Data ◽  
Electron Impact ◽  
Angular Correlation ◽  
Cross Sections ◽  
Differential Cross ◽  
Wave Model ◽  
Theoretical Models ◽  
Angular Distributions ◽  
Distorted Wave ◽  
Correlation Parameters

Angular distributions and (x, λ) angular correlation parameters are calculated in the generalized distorted wave model of Bransden and Issa for 31P excitation of helium in the energy interval 100 to 500 eV. Comparison is made with the experimental data at 100 eV and with the results of the theoretical models. Angular distributions are also presented for the excitation of the 31S and 31D levels, for which a comparison with data is not yet possible.

Relativistic distorted-wave cross sections for electron-impact excitations of berylliumlike ions

1989 ◽  
Vol 39 (9) ◽  
pp. 4509-4517 ◽  
Author(s):  
Wen-Jia Qian ◽  
Yong-Ki Kim ◽  
Jean-Paul Desclaux
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Distorted Wave

Relativistic Distorted-Wave Calculations of Electron Impact Excitation Cross Sections of Be-Like C 2+ Ions

2007 ◽  
Vol 24 (3) ◽  
pp. 691-694 ◽  
Author(s):  
Jiang Jun ◽  
Dong Chen-Zhong ◽  
Xie Lu-You ◽  
Wang Jian-Guo ◽  
Yan Jun ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Distorted Wave ◽  
Excitation Cross Sections

Cross sections for electron-impact ionization of water molecules

2011 ◽  
Vol 89 (6) ◽  
pp. 723-727 ◽  
Author(s):  
Mohammed Sahlaoui ◽  
Mammar Bouamoud
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Impact Ionization ◽  
Transition Amplitude ◽  
Wave Model ◽  
Electron Impact Ionization ◽  
Water Molecules ◽  
Good Precision ◽  
High Incident Energy ◽  
Ionization Of Water

Theoretical triple differential cross sections for the electron-impact ionization of water molecules at high incident energy are presented. The results are derived using an analytical expression for the transition amplitude in the framework of the one Coulomb wave model. For accurate comparison with experiments, an average of the cross sections on the random orientations of the target has been used. The comparison of our results with the available experimental measurements shows that our formalism is able to describe the water molecule ionization process with good precision. The present approach can be used to describe the ionization of other molecular targets with chemical form XHn by other charged particles.

The excitation of the 2 3 P state of helium by electron impact

1960 ◽  
Vol 258 (1293) ◽  
pp. 147-158 ◽  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Ground State ◽  
Wave Method ◽  
Distorted Wave ◽  
Polarization Of Radiation ◽  
Oppenheimer Approximation ◽  
Distorted Wave Method

Cross-sections for excitation of the 2 3 P state of helium from the ground state have been calculated by the distorted-wave method. The polarization of radiation emitted as a result of the excitation is also calculated. Comparison is made with the corresponding results given by the Born—Oppenheimer approximation. Although there are considerable differences at electron energies below 100 eV these are much less marked than for the excitation of the 2 3 S state. The distorted wave method gives cross-sections in closer agreement with observation but substantial discrepancies still remain. It is difficult, however, to estimate their magnitude with any certainty because there are inconsistencies in the observed data.

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