Distorted-Wave Calculations of Triple Differential Cross Section for Inner Shell Ionization

1993 ◽  
pp. 409-421
Author(s):  
X. Zhang ◽  
Colm T. Whelan ◽  
H. R. J. Walters
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Distorted Wave ◽  
Triple Differential Cross Section ◽  
Inner Shell Ionization ◽  
Shell Ionization

(e,2e) studies of processes involving inner-shell ionization

1996 ◽  
Vol 74 (11-12) ◽  
pp. 743-747 ◽  
Author(s):  
Birgit Lohmann ◽  
Steven Cavanagh
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Experimental Studies ◽  
Outer Shell ◽  
Triple Differential Cross Section ◽  
Considerable Success ◽  
Inner Shell Ionization ◽  
Shell Ionization

The (e,2e) technique has been applied to the problem of direct outer shell ionization for many years, with considerable success. In recent years an increasing number of groups have explored the process of inner shell ionization, with a view to obtaining information on the dynamics of the process. In this paper, the existing theoretical and experimental studies of this process are discussed. Our recent measurements of the triple differential cross section for 2p ionization in argon, performed at lower energies than have been used previously, are presented.

Inner shell (e, 2e) processes

1996 ◽  
Vol 74 (11-12) ◽  
pp. 804-810 ◽  
Author(s):  
Colm T. Whelan ◽  
J. Rasch ◽  
H. R. J. Walters ◽  
S. Keller ◽  
H. Ast ◽  
...  
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Relativistic Effects ◽  
Distorted Wave ◽  
Geometrical Arrangement ◽  
Triple Differential Cross Section ◽  
Large Atom ◽  
Physical Effects ◽  
Coincidence Measurements ◽  
Shell Ionization

The great advantage of coincidence measurements is that by suitable choice of the kinematical and geometrical arrangement one may probe delicate physical effects that would be swamped in less differential experiments. The calculation of the triple-differential cross section for the inner shell ionization of high-Z elements at relativistic energies presents a serious challenge to theory. Relativistic effects enter in both the kinematics and the nature of the target, and the large atom exerts a strong distorting influence. We consider such processes in a range of geometries and kinematics. We report the results of fully relativistic distorted wave calculations. Results are presented for silver, gold, and uranium targets and suggestions for further experimental arrangements proposed where delicate relativistic effects should be readily detectable.

scholarly journals Investigating Inner Shell Ionisation via the (e, 2e) Technique

1998 ◽  
Vol 51 (4) ◽  
pp. 679 ◽  
Author(s):  
Birgit Lohmann ◽  
S. J. Cavanagh ◽  
M. A. Haynes ◽  
I. Taouil ◽  
A. Duguet ◽  
...  
Keyword(s):  
Binding Energy ◽  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Valence Shell ◽  
Distorted Wave ◽  
Triple Differential Cross Section

The (e, 2e) technique has been applied successfully to valence shell ionisation of many targets, but studies of inner shell ionisation by this technique have been limited. The triple differential cross section for the latter process exhibits behaviour which is very different to that observed for valence shell ionisation, particularly when the energy of the slow ejected electron is decreased below the binding energy of the inner shell orbital. Our recent results for inner shell ionisation of argon and krypton will be discussed, and comparisons made with distorted wave calculations.

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