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Grazing-angle ion-induced electron excitation at metal surfaces

C Rau and N J Zheng

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Using grazing-angle, ion-induced electron emission spectroscopy at clean and oxygen-covered metal surfaces (Al, Cu, Fe, Ni(110) and Pd(110)), the authors have studied the angle-resolved energy distribution (ARED) of emitted electrons which directly reveals details of the initial electron excitation mechanisms. The authors find that secondary electron cascades are strongly suppressed and that the ion-induced electron excitation occurs predominantly at the topmost surface layer. The major excitation mechanisms for electron emission are single electron excitation via decay of surface and bulk plasmons (for 150 keV H+ ions), electron-hole pair excitation and Auger electron excitation.


PACS

68.47.De Metallic surfaces

79.20.Fv Electron impact: Auger emission

73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 33A (16 August 1993)



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