Vibrational excitation cross sections forF2by electron impact

1986 ◽  
Vol 34 (2) ◽  
pp. 1568-1570 ◽  
Author(s):  
Y. Fujita ◽  
S. Yagi ◽  
S. S. Kano ◽  
H. Takuma ◽  
T. Ajiro ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Excitation Cross Sections

scholarly journals Rotational and Vibrational Excitation of Nitrogen by Electron Impact

1997 ◽  
Vol 50 (3) ◽  
pp. 441 ◽  
Author(s):  
A. G. Robertson ◽  
M. T. Elford ◽  
R. W. Crompton ◽  
Michael A. Morrison ◽  
Weiguo Sun ◽  
...  
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Unsolved Problem ◽  
Vibrational Excitation ◽  
Rotational Excitation ◽  
Early Analysis ◽  
Excitation Cross Sections ◽  
Low Energy Electron ◽  
Experimental Values ◽  
Best Fit

Rotational excitation of nitrogen by low-energy electron impact has posed an unsolved problem for more than three decades. Early analysis of the results of swarm experiments in nitrogen found that the data could be matched remarkably well by assuming that the energy dependences of the Δj = 2 cross sections from threshold to a few tenths of an eV are given by a simple formula based on the Born approximation. Moreover, the quadrupole moment (the only adjustable parameter in the formula) which gave the best fit to the data was commensurate with existing experimental values. This finding posed an enigma, since the quadrupole Born expression is known to incorrectly represent the interaction potential for scattering except within a few meV of threshold. We have analysed new swarm data, taken in a dilute mixure of nitrogen in neon, using theoretical rotational and momentum transfer cross sections based on a solution of the Schrödinger equation using static, exchange, and polarisation potentials. This work explains the long-standing enigma and provides the basis for a subsequent analysis in which theoretical vibrational excitation cross sections are also investigated using the new swarm data for the mixture.

scholarly journals Electron impact vibrational excitation cross sections of SiF4

1996 ◽  
Vol 68 (16) ◽  
pp. 2189-2191 ◽  
Author(s):  
R. Nagpal ◽  
A. Garscadden ◽  
J. D. Clark
Keyword(s):  
Electron Impact ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Excitation Cross Sections
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