Electron impact excitation of the 33P state of helium: coherence parameters
- 14 November 1990
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic, Molecular and Optical Physics
- Vol. 23 (21) , 3993-4004
- https://doi.org/10.1088/0953-4075/23/21/029
Abstract
In an electron-photon coincidence experiment the authors have measured the polarization degree of the decay radiation from the electron impact excited 33P to 23S transition in helium. They performed their measurements perpendicular to the scattering plane. To analyse the polarization they used a beam splitting polarizer instead of the usual sheet polarizer. The linear polarization degree was measured at an electron impact energy of 40 eV and the circular polarization degree was measured at 40, 60 and 80 eV. The electron scattering angle ranged from 32.8' to 116'. The experimentally determined degrees of polarization are in good agreement with the theoretical results of the distorted-wave Born approximation (DWBA). The scaling relation of Lin et al. (1989) is in agreement with the DWBA results of the circular polarization for 33P excitation.Keywords
This publication has 18 references indexed in Scilit:
- Measurement of coherence parameters for the electron impact excitation of the 31D state of helium at small electron scattering anglesJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- Polarisation correlation study of the 31D state of heliumJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- Differential cross sections for the excitation of the ground state of helium to the 2,3,43S, 2,3,41S, 2,3,43P and 2,3,41P states at 29.6 eVJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- Collisional alignment and orientation of atomic outer shells I. Direct excitation by electron and atom impactPhysics Reports, 1988
- Angular correlation study of He(33P) excited by electron impactJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- Differential cross sections and angular correlation parameters for electron impact excitation of the 33P, 31D and 33D states of heliumJournal of Physics B: Atomic, Molecular and Optical Physics, 1988
- A coincidence study on the electron impact excitation of the 33P state of heliumJournal of Physics B: Atomic and Molecular Physics, 1987
- Electron-photon coincidence parameters for the excitation of the n3P (n=2-8) states of heliumJournal of Physics B: Atomic and Molecular Physics, 1986
- Measurements of Complex Excitation Amplitudes in Electron-Helium Collisions by Angular Correlations Using a Coincidence MethodPhysical Review Letters, 1973
- Electron Excitation of the Calcium 4227-Å Resonance LinePhysical Review A, 1973