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Interaction of wide band gap single crystals with 248 nm excimer laser irradiation. VI. The influence of thermal pretreatment on laser desorption of positive ions from a water-containing ionic crystal (CaHPO4∙2H2O)

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4 Author(s)
Kawaguchi, Y. ; Physics Department, Washington State University, Pullman, Washington 99164-2814 ; Dawes, M.L. ; Langford, S.C. ; Dickinson, J.T.

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Morphological changes during dehydration of single crystals containing lattice H2O (hydrates) can be dramatic, leading to surfaces that are rough, polycrystalline, and laden with defects. Previous studies have shown that ionic crystal surfaces containing point defects readily desorb energetic positive ions under UV excimer laser irradiation. In this work, we examine the consequences of exposing thermally pretreated single crystal brushite (CaHPO4∙2H2O) to 30 ns pulses of 248 nm laser irradiation and show that the surface modifications strongly enhance the emission of Ca+ and other positive ions. © 2000 American Institute of Physics.

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Journal of Applied Physics  (Volume:88 ,  Issue: 2 )