Synergisms at surfaces involving radiation and solvents: nanometer scale implications

J. Thomas Dickinson; Khin Hla Nwe; Steve C. Langford

doi:10.1117/12.482086

13 September 2002 Synergisms at surfaces involving radiation and solvents: nanometer scale implications

J. Thomas Dickinson, Khin Hla Nwe, Steve C. Langford

Proceedings Volume 4760, High-Power Laser Ablation IV; (2002) https://doi.org/10.1117/12.482086
Event: International Symposium on High-Power Laser Ablation 2002, 2002, Taos, New Mexico, United States

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 CaHPO₄ 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.

Citation Download Citation

J. Thomas Dickinson, Khin Hla Nwe, and Steve C. Langford "Synergisms at surfaces involving radiation and solvents: nanometer scale implications", Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); https://doi.org/10.1117/12.482086

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