Coherent Excitation of Ar 4s'[1/2]₁⁰ and 4s[3/2]₁⁰ by Low Energy Electrons
Electron-photon coincidence measurements are reported of the excitation of the 4s'[1/2]10 state of Ar at incident energies of 20 and 30 eV and scattering angles up to 80°. All values of the ρ 00 parameter obtained are very small and not distinguishable from zero within experimental uncertainty. The level of agreement with available perturbative theories is quite good but significant discrepancies are noted at some angles particularly at the lower impact energy. Previous measurements from this laboratory of the 4s[3/2]10 state are reanalyzed in terms of the ratio of the exchange to direct excitation cross sections.
S. Wang et al., "Coherent Excitation of Ar 4s'[1/2]₁⁰ and 4s[3/2]₁⁰ by Low Energy Electrons," Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 27, no. 2, pp. 329-339, Institute of Physics - IOP Publishing, Jan 1994.
The definitive version is available at https://doi.org/10.1088/0953-4075/27/2/010
Keywords and Phrases
Coherent excitations; Direct excitation; Electron-photon coincidence; Experimental uncertainty; Impact energy; Incident energy; Low energy electrons; Scattering angles; Physics; Excited states
International Standard Serial Number (ISSN)
Article - Journal
© 1994 Institute of Physics - IOP Publishing, All rights reserved.
01 Jan 1994