EMISSION OF SECONDARY IONS FROM CONDUCTIVE MATERIALS
BOMBARDED WITH HIGH ENERGY HEAVY IONS


T. SEKIOKA*, M. TERASAWA*, M. SATAKA#, S. KITAZAWA# and M. NIIBE**


*Department of Physics, Himeji Institute of Technology, Himeji, Hyogo,
671-2201 Japan
#Japan Atomic Energy Research Institute (JAERI), Tokai-mura, Ibaraki,
319-1195 Japan
**Laboratory of Advanced Science and Technology for Industry, Himeji
Institute of Technology,
Kamigori, Hyogo, 678-1201 Japan


We have studied the dependence on the electronic stopping power of
secondary ion yield from thin conductive solid targets irradiated by high
energy heavy ion beams from the JAERI tandem accelerator. The results show
the importance of the electronic excitation effect. It is suggested that
Coulomb explosion is the major mechanism of producing the columnar defects
along the incident ion path.