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Energy spectra of secondary electrons from Al induced by high speed He2+ and Ar12+ impact

1986; Elsevier BV; Volume: 13; Issue: 1-3 Linguagem: Inglês

10.1016/0168-583x(86)90582-3

1872-9584

Akio Kôyama, O. Benka, Y. Sasa, M. Uda,

X-ray Spectroscopy and Fluorescence Analysis

Spectra of secondary electrons from Al produced by He2+ and Ar12+ ion impact (1.1 MeV/amu) were measured and compared with each other in the energy region below 170 eV. Ratios of secondary electron emission yields for Ar12+ impact to those for He2+ impact showed q2-proportionality in the high-energy region above 80 eV, but a prominent decrease in the energy region below 20 eV. It is proposed that this large reduction in the low energy region can be explained by a pronounced decrease in the creation of electron-hole pairs due to plasmon damping, together with the decrease in ionization cross sections of conduction electrons due to a correlation effect in high density ionization.