Mb. Shah et al., ELECTRON-CAPTURE AND TRANSFER IONIZATION IN COLLISIONS OF FAST H+ ANDHE2+ IONS WITH CU ATOMS, Journal of physics. B, Atomic molecular and optical physics, 28(9), 1995, pp. 1821-1833
One-electron capture involving either simple charge transfer or transf
er ionization leading to the formation of Cu-q+ ions for q = 1-5 has b
een studied for H+-Cu collisions in the energy range 70-720 keV amu(-1
). Both one- and two-electron capture by He2+ ions leading to Cu-q+ io
ns for q = 1-7 and q = 2-5 in the ranges 35-360 keV amu(-1) and 35-150
keV amu(-1) respectively have been determined. A crossed beam coincid
ence counting technique has been used to measure cross sections for ea
ch of these processes corresponding to particular values of q. In the
case of H+-Cu collisions, measured fractions of Cu-q+ ions formed in p
articular states of q have also been satisfactorily described in terms
of an independent electron model with electron removal from either th
e 4s or 3d subshells. Comparisons between the present cross sections f
or H+ and He2+ impact have also been made with the corresponding value
s previously measured for iron.