Layer-dependent laser sputtering of BaF2 (111)

Reif, J.; Fallgren, H.; Nielsen, H. B.; Matthias, E.
October 1986
Applied Physics Letters;10/13/1986, Vol. 49 Issue 15, p930
Academic Journal
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 rates 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.


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