SEDL / STP / STP1028-EB / STP18587S

Wavelength Dependence of Laser-Induced Sputtering from the (111) Surface of BaF²

Reif, J
Institut für Atom- und Festkörperphysik Freie Universität, Berlin, West Germany

Fallgren, H
Chalmers Institute of Technology, Göteborg,

Cooke, WE
University of Southern California, Los Angeles, CA

Matthias, E
Institut für Atom- und Festkörperphysik Freie Universität, Berlin, West Germany

Pages: 12    Published: Jan 1988

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Abstract

Using blue tunable pulse laser radiation of low fluence, we have investigated laser-induced sputtering from cleaved BaF² (111) surfaces under ultrahigh vacuum conditions. Timecorrelated with the laser pulses we observed the positiveions Ba⁺, Ba⁺⁺, (BaF)⁺, and F⁺. Practically no negative ions were found. Neutral atomic fluorine (F°) was desorbed abundantly. A pulse correlation of F° as well as the relative amount of F° and F⁺ could not be established at this stage. The emission yield of all positive ions as well as of F° was strongly wavelength dependent and showed a broad resonance around 2.9 eV.