Article

Strongly enhanced backward emission of electrons in transfer and ionization.

Physics Department and LAMOR, Missouri University of Science & Technology, Rolla, Missouri 65409, USA.
Physical Review Letters (impact factor: 7.37). 01/2012; 108(4):043202. pp.043202
Source: PubMed

ABSTRACT We studied three-dimensional angular distributions and longitudinal momentum spectra of electrons ejected in transfer plus ionization (TI), i.e., the ejection of one and the capture of a second target electron, for ion-helium collisions. We observe a pronounced structure strongly focused opposite to the projectile beam direction, which we associate with a new correlated TI mechanism proposed recently. This process contributes significantly to the total cross sections over a broad range of perturbations η, even at η as large as 0.5, where uncorrelated TI mechanisms were thought to be dominant.

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Keywords

broad range
 
dominant
 
ejection
 
ionization
 
longitudinal momentum spectra
 
new correlated TI mechanism
 
perturbations η
 
process contributes
 
projectile beam direction
 
second target electron
 
sections
 
three-dimensional angular distributions
 
TI
 
uncorrelated TI mechanisms
 

M Schulz