Charge-state dependence of inner-shell vacancy production in heavy ion-atom collisions with atomic number larger than 10
Year: 1981
Type: article
Abstract: X-ray production cross sections have been measured for Ne K X-rays in Ne-Ar, Kr and Ar-Ne collisions, Kr L X-rays in Ar-Kr and Kr-Kr, Xe and Ar K X-rays in Ar-Ar, Xe. Projectile energies used were 60 to 1150 keV for neon ions, 300 to 2000 keV for argon ions and 175 to 1900 keV for krypton ions. The range of charge states used was 1+ to 4+ for neon and 2+ to 7+ for argon and krypton ions. The vacancy production cross sections extracted from the X-ray data show no charge-state dependence and indicate that two-step processes are not important. It is proposed that near the united-atom limit a direct coupling from molecular orbitals (MO) to the continuum is important. A large difference in the excitation function was seen depending on whether 2p sigma , 3d sigma or 4f sigma MO were involved. It is proposed that this strong dependence is caused by the relative difference in the energy gap and the shape of the MO involved. The data are compared with estimates from the modified BEA scaling law and the statistical model. For the latter model systematic deviations with experiment are found.
Authors: P H Woerlee, R J Fortner, F W Saris
Institution: Institute for Atomic and Molecular Physics
Language: English
Subfield: Radiation
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2092471283