Comparison of Heavy Ion-Induced K-alpha X-Ray Satellite Spectra from Gases and Solids.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
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A study of the effects of chemical environment on the K-alpha satellite spectra of Si, SiF4, SiH4, P4, S8, SF6, SO2, H2S, NaCl, KCl Cl, CCl4, Cl2, HCl, Ar and KCl K excited by 32.4 MeV oxygen ions has been performed. The average degree of L-shell ionization at the time of K-alpha x-ray emission as reflected by the satellite relative intensities are much higher for the light gases SiH4, H2S, and HCl than for the corresponding heavy gases, solids, and liquid. It was determined from their correlation with local valence electron density that the L-shell ionization states do not depend upon physical state but upon the availability of electrons from neighboring atoms. For atoms with electron rich ligands, interatomic electron transfer dominates the fast rearrangement occurring prior to K-alpha x-ray emission. The comparison of K-alpha satellite energy shifts with the results of Hartree-Fock calculations provided further support for the above conclusions. A theoretical prediction of multiple ionization employing the binary encounter approximation was found to overestimate the observed degree of L-shell ionization but that considerably improved agreement was obtained by accounting for the increases in L-shell binding energy as L-shell electrons are removed.
- Atomic and Molecular Physics and Spectroscopy