SEDL / STP / STP1028-EB / STP18588S

Layer-Dependent Laser Sputtering of BaF² (111)

Reif, J
Institut fur Atom und Festkorperphysik Freie Universitat Berlin, Berlin 33,

Fallgren, H
Institut fur Atom und Festkorperphysik Freie Universitat Berlin, Berlin 33,

Nielsen, HB
Institut fur Atom und Festkorperphysik Freie Universitat Berlin, Berlin 33,

Matthias, E
Institut fur Atom und Festkorperphysik Freie Universitat Berlin, Berlin 33,

Pages: 13    Published: Jan 1988

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Abstract

Laser-induced sputtering from the (111) surface of BaF² was investigated under ultrahigh vacuum conditions, applying fluences well below the macroscopic damage threshold. Measurement of the wavelength dependent desorption of Ba⁺ indicates that Ba⁺ is emitted from two chemically different surroundings at the surface. For a fixed wavelength, the emission rate of Ba⁺ and F⁺ as functions of time show a distinct anticorrelation, confirming the existence of two different chemical states of the surface, and suggesting that the sputtering takes place layer by layer.