Experimental Studies Of Photon-Surface Interaction Dynamics In The Alkali Halides

Richard F. Haglund Jr.; Norman H. Tolk

doi:10.1117/12.936592

12 August 1986 Experimental Studies Of Photon-Surface Interaction Dynamics In The Alkali Halides

Richard F. Haglund Jr., Norman H. Tolk

Proceedings Volume 0690, X-Rays in Materials Analysis: Novel Applications and Recent Developments; (1986) https://doi.org/10.1117/12.936592
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

We describe recent measurements which have provided, in unprecedented detail, insights into the electronic mechanisms through which energy carried into a material by photon irradiation is absorbed, localized and rechanneled to produce desorption, surface modification, erosion and damage. The specific object of these studies has been desorption induced by electronic transitions in alkali halide crystals, with particular emphasis on the dynamics of changes in the surface and near-surface regions. In our experiments, the irradiating ultraviolet photons are provided by a synchrotron storage ring, and the dynamical information about desorption products is obtained from optical measurements of the quantum states, yields and velocity distributions of neutral ground-state and excited-state atoms ejected from the surface of the irradiating material. These studies have shown that the dominant exit channels in photon-induced particle emission are those producing ground-state and excited-state neutral atoms. Using dynamical information about these desorbing neutral species, obtained, for example, by laser-induced fluorescence and laser Doppler spectroscopy, we are generating an increasingly comprehensive picture of the dynamics of electronic energy flow into and out of pure crystalline surfaces in these prototypical dielectrics. We are also beginning to be able to relate desorption dynamics to specific materials properties, and to discriminate between pure surface and near-surface effects in these materials. Applications of these techniques to the problem of photon-induced surface damage and to analysis of surface dynamics in dielectric materials are discussed, and the relationships between these nearly ideal model materials and the non-crystalline, covalently bonded materials more typical of real optical elements are pointed out.

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Richard F. Haglund Jr. and Norman H. Tolk "Experimental Studies Of Photon-Surface Interaction Dynamics In The Alkali Halides", Proc. SPIE 0690, X-Rays in Materials Analysis: Novel Applications and Recent Developments, (12 August 1986); https://doi.org/10.1117/12.936592

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