X-RAY-EMISSION STUDIES FROM HIGHLY IONIZED SWIFT PROJECTILES PASSING THROUGH THIN CARBON FOIL

X-rays have been detected from highly ionized swift projectiles of As- 75 and Se-80 passing through thin carbon foils. The investigations hav e been made at two projectile energies of 55 and 80 MeV for As-75 ions and 66 and 90 MeV for Se-80 ions. The K-beta/K-alpha ratios of the io ns have been found to be almost half of the free atom values which can be attributed to the sum of the effects caused by vacancies in L and M Shells. In addition to two normal L X-ray peaks a third peak corresp onding to L-REC (L-shell radiative electron capture) has been observed . All the X-ray lines show a shift towards higher energy due to pertur bation of the energy levels. The relative REC cross-section between lo wer and higher projectile energies shows excellent agreement with the theoretical results obtained under the dipole approximation.