| Issue |
J. Phys. Colloques
Volume 48, Number C7, Décembre 1987
1st International Laser M2P Conference
|
|
|---|---|---|
| Page(s) | C7-737 - C7-740 | |
| DOI | https://doi.org/10.1051/jphyscol:19877181 | |
1st International Laser M2P Conference
J. Phys. Colloques 48 (1987) C7-737-C7-740
DOI: 10.1051/jphyscol:19877181
1 Fachbereich Physik, Freie Universität Berlin, Institut für Atom- und Festkörperphysik, Arnimallee 14, D-1000 Berlin 33, F.R.G.
2 Institute of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden
J. Phys. Colloques 48 (1987) C7-737-C7-740
DOI: 10.1051/jphyscol:19877181
RESONANT MULTIPHOTON PROCESSES IN LASER-INDUCED DESORPTION
J. REIF1, H. B. NIELSEN1, E. MATTHIAS1, E. WESTIN2 and A. ROSÉN21 Fachbereich Physik, Freie Universität Berlin, Institut für Atom- und Festkörperphysik, Arnimallee 14, D-1000 Berlin 33, F.R.G.
2 Institute of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden
Abstract
The dye laser induced emission of positive ions from the surface of cleaved highly transparent bariumfluoride shows a pronounced dependence on the exciting laser wavelength. Qualitatively, the same spectra are observed for the emission of electrons. For fixed wavelengths, the emission yields of electrons and positive ions follow higher powers of the laser intensity. Consequently, photoemission is interpreted by resonantly enhanced two-photon (for less than ~1.7 MW/cm2 laser intensity) respectively five-photon (for higher laser intensity) absorption. Ion desorption then follows from the combination of two holes at a fluorine site.