Signature of Ericson fluctuations in helium inelastic scattering cross sectionsnear the double ionization threshold

摘要

We calculated the inelastic electron impact excitation cross sections of He by electrons for a model heliumatom to examine the onset of the signature of quantum chaotic scattering in this simple system. We find Ericsonfluctuations (EF) in the calculated inelastic scattering cross sections only when the impact energies lie withinabout 0.21 eV below the double ionization threshold. We also discuss the stringent requirements and the propermethods for analyzing the inelastic scattering cross sections in order to observe EF experimentally.