Electron-impact excitation of He: Dependence of electron-photon coherence parameters on the principal quantum number
- 1 December 1987
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 36 (11) , 5127-5129
- https://doi.org/10.1103/physreva.36.5127
Abstract
Measurements are presented representing a complete set of electron-photon polarization correlation parameters for the excitation of n states of He at an incident energy of 80 eV and an electron scattering angle of 20°. The data support the predictions of a recent theoretical paper that these parameters should exhibit little variation with n. However, disagreement in absolute values between experiment and theory indicates the need for additional theoretical input into the problem.
Keywords
This publication has 13 references indexed in Scilit:
- Principal-quantum-number dependence of coherence and correlation parameters for excitation of helium by electronsPhysical Review A, 1986
- A second-order distorted-wave model for the excitation of the 21P state of helium by electron and positron impactJournal of Physics B: Atomic and Molecular Physics, 1983
- Angular correlation measurements for the electron-excited 31P state of heliumJournal of Physics B: Atomic and Molecular Physics, 1981
- Electron-proton angular correlation measurements for the 21P state of heliumJournal of Physics B: Atomic and Molecular Physics, 1980
- The 11S to 21S and 11S to 21P excitation of helium by electron impactJournal of Physics B: Atomic and Molecular Physics, 1980
- Alignment and orientation in the electron-impact excitation of thestate of He from 40 to 500 eVPhysical Review A, 1980
- Photon Vector Polarization and Coherence Parameters in an Electron-Photon Coincidence Experiment on HeliumPhysical Review Letters, 1976
- Electron-photon angular correlations in electron-helium collisions for 31P excitationsJournal of Physics B: Atomic and Molecular Physics, 1975
- Electron-photon angular correlations in electron-helium collisions: measurements of complex excitation amplitudes, atomic orientation and alignmentJournal of Physics B: Atomic and Molecular Physics, 1974
- Measurements of Complex Excitation Amplitudes in Electron-Helium Collisions by Angular Correlations Using a Coincidence MethodPhysical Review Letters, 1973