Zhangjin Chen et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 2333 doi:10.1088/0953-4075/40/12/009
Zhangjin Chen1,3, D H Madison1 and K Bartschat2
Show affiliationsTriple-differential cross sections for electron impact ionization of helium at 102 eV are presented for both coplanar and perpendicular plane asymmetric geometries within the framework of second-order distorted-wave theory. The closure approximation and the simplified Green's function approximation, which are currently used in the evaluation of the second-order amplitudes, are investigated and the accuracy of the approximations is examined. It is found that second-order effects are significant for this incident energy and the simplified Green's function approximation is generally more valid than the closure approximation.
Issue 12 (28 June 2007)
Received 3 March 2007, in final form 11 April 2007
Published 5 June 2007
Zhangjin Chen et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 2333
C Scholey et al 2005 J. Phys. G: Nucl. Part. Phys. 31 S1719
Colin J. Lonsdale et al. 2006 ApJ 647 185
Larry W Esposito 2002 Rep. Prog. Phys. 65 1741
S B Whitfield et al 1994 J. Phys. B: At. Mol. Opt. Phys. 27 L359
A Bäcker et al 2002 J. Phys. A: Math. Gen. 35 10293
Katharina Lodders 1999 ApJ 519 793
Gregory Berkolaiko et al 2003 J. Phys. A: Math. Gen. 36 8373
James J. Wray et al. 2006 ApJ 652 907
Heinz-Peter Breuer 2006 J. Phys. A: Math. Gen. 39 11847