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Proceedings Paper

Synergisms at surfaces involving radiation and solvents: nanometer scale implications
Author(s): J. Thomas Dickinson; Khin Hla Nwe; Steve C. Langford
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Paper Abstract

We present studies of the consequences of simultaneous exposure of inorganic single crystals to radiation and water. The first case consists of a biomineral namely CaHPO 4 2H2O (brushite) which is a wide band gap, hydrated inorganic single crystal. We examine the laser induced ion and neutral emissions accompanying 248-nm excimer laser radiation. Both types of emission are several orders of magnitude higher following exposure to 2 keV electrons at current densities of 200 μA/cm 2 and doses of 102-103 mC/cm2. We show the that the enhancements in emission are strongly correlated with e-beam induced morphology changes (including recrystallization) on this unusual surface. We then examine similar effects on dry crystals such as NaCl and NaNO3 which are exposed to 10-5 Pa partial pressures of H2O. Again dramatic enhancements in radiation induced emissions are exhibited along with the generation of unique morphological structures with nanometer scale dimensions.

Paper Details

Date Published: 13 September 2002
PDF: 12 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482086
Show Author Affiliations
J. Thomas Dickinson, Washington State Univ. (United States)
Khin Hla Nwe, Washington State Univ. (United States)
Steve C. Langford, Washington State Univ. (United States)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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