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FIZIKA A 18 (2009) 1 , 9-18
 
TWO-ELECTRON CAPTURE CROSS SECTIONS INTO GROUND STATE IN COLLISION OF BARE
PROJECTILE IONS WITH HELIUM ATOM
S. GHOSHa, A. DHARAa, C. R. MANDALa and M.
PURKAITb
aDepartment of Physics, Jadavpur University, Kolkata, 700 032, India
bDepartment of Physics, Ramakrishna Mission Residential College, Narendrapur, Kolkata, 700 103, India
Received 1 August 2007 Revised manuscript received 16 January 2009
Accepted 18 February 2009 Online 21 May 2009
Double charge-transfer cross-sections from ground state of helium atoms by
multiply-charged bare ions have been studied in the energy range 50 - 200 keV/amu
to investigate the dependence of cross-sections on the charge state of different
ions (He2+, Li3+, Be4+, B5+, C6+,
N7+ and O8+). In our calculation, we have employed the
four-body boundary-corrected continuum intermediate state (BCCIS-4B)
approximation. The variation of double charge transfer cross sections of bare
ions into the ground state is displayed versus the incident projectile energy.
Due to the non-availability of any theoretical and experimental findings in that
energy range for collision systems under study (Be4+, B5+,
C6+, N7+ and O8+ + He), we can not compare the
present results with other data. We have also analysed differential
double-capture cross sections for the collision of a-particle with helium atom at 1500 keV. The obtained results for the
differential double-capture cross sections into the ground state are compared
with the experimental data and a satisfactory agreement has been obtained.
PACS numbers: 34.10+1, 34.90.+q
UDC 539.196, 539.186
Keywords: double capture cross sections, differential cross section,
continuum state wavefunction, bare ions
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