SYMPOSIA PAPER Published: 01 January 1988

Laser Induced Desorption and Second Harmonic Generation from the (111) Surface of Barium Fluoride


The desorption of positive ions from the (111) surface of BaF2 induced by visible laser light with photon energies far below the bandgap (in the green (500–560 nm) and blue (410–440 nm) spectral regions) shows sharp resonances (∼ 0.01 eV). Cluster calculations indicate that there exist occupied and excitonic surface states which facilitate resonant multiphoton photoemission from the surface. This, in turn, leads to a localized positive charge-up which results in the emission of positive ions. The influence of surface states seems to be present also in air judging from experiments on surface second harmonic generation which exhibit both a pronounced surface anisotropy and a wavelength dependent second harmonic yield.

Author Information

Reif, J
Nielsen, HB
Semmler, O
Tepper, P
Matthias, E
Fridell, E
Westin, E
Rosén, A
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Developed by Committee: F01
Pages: 205–216
DOI: 10.1520/STP24424S
ISBN-EB: 978-0-8031-5033-1
ISBN-13: 978-0-8031-4481-1