Characteristic and quasimolecular X-rays from collision systems with Z1 + Z2 = 133, 134 under single and multiple collision conditions

Measurements with Hg-vapor targets bombarded with 18 MeV to 150 MeV xenon ions show that M-Mo X-rays are excited in a single collision, and target L-lines are suppressed in gas targets compared to solids, furthermore, projectile L-lines show a pressure dependent energy shift of 50 eV between 10^?3 and 1 Torr.