Wavelength dependence of laser-induced sputtering from the (111) surface of BaF2

Reif, J.; Fallgren, H.; Cooke, W. E.; Matthias, E.
September 1986
Applied Physics Letters;9/29/1986, Vol. 49 Issue 13, p770
Academic Journal
Using blue tunable pulse laser radiation of low fluence, we have investigated laser-induced sputtering from cleaved BaF2 (111) surfaces under ultrahigh vacuum conditions. Time correlated with the laser pulses the positive ions Ba+, Ba++, (BaF)+ and F+ were observed. Practically no negative ions were found. Neutral atomic fluorine (F 0) was desorbed abundantly. A pulse correlation of F 0 as well as the relative amount of F 0 and F+ could not be established at this stage. The emission yield of all positive ions as well as of F 0 was strongly wavelength dependent and showed a broad resonance around 2.9 eV.


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