Near-Threshold Structure in the Atomic K-Shell Spectra for Ionisation by Photons or Fast Charged Particles
Abstract
Spectra of the optical and generalised oscillator strength for the K-shell ionisation of all free atoms with Z < or = 30 have been calculated within the framework of a Hartree-Slater central potential. One of our findings is that the spectra (at fixed small values of momentum transfer including the optical limit) are rich in structure, i.e. the spectral strength is non-monotonic in the kinetic energy of an ejected electron near the K threshold, for all atoms with Z > or = 8. This is in sharp contrast to the hydrogenic result, according to which the spectral strength for every shell monotonically decreases with the kinetic energy. The magnitude of the near-threshold structure sometimes amounts to 30%. A partial interpretation of the structure is given and consequences of these results to applications such as electron energy-loss spectroscopy and stopping power calculations are pointed out.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1980
- Accession Number
- ADA095495
Entities
People
- Mitio Inokuti
- Steven T. Manson
Organizations
- Georgia State University