scholarly journals Unusual angular momentum transfer in electron-impact excitation of neon

2012 ◽  
Vol 85 (5) ◽  
Author(s):  
L. R. Hargreaves ◽  
C. Campbell ◽  
M. A. Khakoo ◽  
Oleg Zatsarinny ◽  
Klaus Bartschat
Keyword(s):  
Angular Momentum ◽  
Momentum Transfer ◽  
Electron Impact ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Angular Momentum Transfer

Polarization and orientation in electron impact excitation to Ne*(2p53p) states

1996 ◽  
Vol 74 (11-12) ◽  
pp. 897-905 ◽  
Author(s):  
A. W. Baerveldt ◽  
W. B. Westerveld ◽  
J. van Eck ◽  
H. G. M. Heideman
Keyword(s):  
Angular Momentum ◽  
Electron Impact ◽  
Excited States ◽  
Electron Scattering ◽  
Total Angular Momentum ◽  
Stokes Parameters ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Theoretical Discussion ◽  
Excitation Mechanism

The electron impact excitation of ground-state neon atoms to several, generally not LS-coupled, Ne*(2p53p) states is studied by electron-polarized photon coincidence experiments on the Ne*(2p53p) → Ne*(2p53s) decay radiation. For four transitions the Stokes' parameters P1 to P4 are published at fixed incident electron energies of 50 and 80 eV and in the electron scattering range of 22°–70°. A theoretical discussion is presented to show how information about the collision process can be extracted from the experimental results. For excitation to the three excited states with total angular momentum J = 2 the behaviour of the total angular momentum transfer [Formula: see text] as a function of the electron-scattering angle at 50 eV strongly suggests a common excitation mechanism.

scholarly journals Large Momentum Transfer Excitation of He(31P) by Electron Impact at 81· 2 eV Incident Energy

1982 ◽  
Vol 35 (5) ◽  
pp. 513 ◽  
Author(s):  
R McAdams ◽  
JF Williams
Keyword(s):  
Momentum Transfer ◽  
Electron Impact ◽  
Incident Energy ◽  
Theoretical Calculations ◽  
Large Momentum Transfer ◽  
Impact Excitation ◽  
Electron Impact Excitation ◽  
Large Momentum

This paper reports measurements of helium A and X parameters for electron impact excitation of the 31 P state of helium at an incident energy of 81 �2 e V and at large momentum transfers. Comparison is made with previous 21P results and both sets of results show very similar trends. The data are also compared with a number of theoretical calculations but the agreement is not good.

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