Electron impact excitation of the 3 <sup>1</sup>D state of helium - an electron-photon coherence study at small scattering angles
Danica Cvejanovic; Damien T McLaughlin; Albert Crowe; Danica Cvejanovic; Department of Physics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK; Damien T McLaughlin; Department of Physics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK; Albert Crowe; Department of Physics, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK
Журнал:
Journal of Physics B: Atomic, Molecular and Optical Physics
Дата:
2000-08-28
Аннотация:
Electron impact excitation of the 3 <sup>1</sup>D state of helium has been studied using the scattered electron-polarized photon correlation method. Results are presented at incident electron energies of 26.5, 29.6, 40.0, 45.0 and 60.0 eV for scattering angles up to 40°. The data presented here complement the previous large angle data from this laboratory and taken together provide a complete mapping of the dimensionless parameters characterizing excitation of the 3 <sup>1</sup>D state of helium over a wide range of both angle and energy. Strong variations in the parameters as a function of energy and angle are discussed. Good agreement is observed between the experimental data and recent theoretical predictions.
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