Journal of the Physical Society of Japan · 1982 · 48 citations · 4 references
Natural SciencesPhysicsAtomic PhysicsNuclear PhysicsSpectroscopyAtomic ExcitationAtomic IonizationHydrogen AtomIonization ProcessesElectron Impact CollisionsElectron Impact IonizationElectron-impact ExcitationElectron-ion CollisionsElectron-positron CollisionsExcitation Cross SectionsIonization Cross Sections
The 2 1 S-excitation cross-section Q exc and the ionization cross-section Q ion of He atom by positron impact were obtained in the range of 24∼120 eV positron energies by the time spectrum in the retarding potential-TOF method. The excitation cross-section is consistent with those by Coleman and Hutton at the energies below 31 eV. The values of Q ion agreed with those by electron-collision measurements.
4
Excitation of Helium Atoms by Positron Impact
P. G. Coleman, J. T. Hutton · Physical Review Letters · 1980 · 35 citations