Deviations of the K-beta/K-alpha intensity ratio of Ti upon impact with low velocity ions

Deviations of the branching ratio of the decay of K-vacancies in Ti have be en observed juring bombardment with low velocity ions of H, He and N. Beams of these ions have been used for various applications in which resonant nu clear reactions were used as the main analytical technique, whereas the X-r ay signal could conveniently be used for monitoring the accumulated charge. During the evaluation of this monitoring signal, it was observed that the commonly made assumption that the K-beta/K-alpha intensity ratio is a const ant can easily be off by 30%; or more. Also a few data of L-shell ionisatio n cross sections has been measured on Au to establish if the onset of devia tions in the branching ratio parallels the onset of deviations from the ECP SSR theory for inner shell ionisation. (C) 1999 Published by Elsevier Scien ce B.V. All rights reserved.