Electron-photon-correlation study of the 3 1 D state of helium excited by electrons 3.5 eV above threshold
1994; American Physical Society; Volume: 49; Issue: 4 Linguagem: Inglês
10.1103/physreva.49.2545
ISSN1538-4446
AutoresD T McLaughlin, B P Donnelly, A Crowe,
Tópico(s)Quantum, superfluid, helium dynamics
ResumoA complete electron-photon polarization-correlation study of the 3 $^{1}$D state of helium excited by 26.5-eV incident electrons is carried out for electron scattering angles in the range 40\ifmmode^\circ\else\textdegree\fi{}--120\ifmmode^\circ\else\textdegree\fi{}. The data are analyzed in terms of the shape and dynamics of the excited-state charge cloud. When the results are considered in the natural coordinate frame, the excitation is dominated by the M=+2 excitation amplitude. The lack of theoretical calculations for S-D excitation processes is this energy regime is highlighted.
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