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Atomic and molecular photostimulated desorption from complex ionic crystals

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Abstract

Calcium carbonate and sodium nitrate are isostructural crystals in which the covalently bonded polyatomic anions are also isoelectronic, however, the chemical properties of these crystals are distinctly different. In this study, we report results involving the photostimulated desorption (PSD) of neutral CO and O(3P) products from geologic calcite (CaCO3) using low laser fluence at 193 nm. Product states are probed using (2+1) resonance enhanced multiphoton ionization for both neutrals. The CO products display a narrow angular distribution normal to the surface and a translational energy characterized, by a temperature (T=110K) significantly lower than that of the substrate (T=295K).1 Atomic oxygen products display both broader angular and kinetic energy distributions than that of the CO fragments. Emission of O(3P) is seen at angles greater than 30° with respect to the surface normal. In contrast, recent PSD studies of product NO from single crystal sodium nitrate (NaNO3) show product distributions with both thermal and hyper-thermal components.2 Projected density of state plots computed using periodic Hartree-Fock theory indicate a strong overlap in the metal and carbonate bands of the low lying excited states in CaCO3, while NaNO3 was found to have a well-separated nitrate band in the excited state below the mixed metal/nitrate bands. The differences in the electronic structure of these materials may account for differences in the observed product distributions in the PSD of calcite and sodium nitrate.

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Authors and Affiliations

  1. Environmental Molecular Sciences Laboratory, Pactfic Northwest National Laboratory, 99352, Richland, WA

    Kenneth M. Beck, Maureen I. Mccarthy & Wayne P. Hess

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  1. Kenneth M. Beck
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  2. Maureen I. Mccarthy
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  3. Wayne P. Hess
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Beck, K.M., Mccarthy, M.I. & Hess, W.P. Atomic and molecular photostimulated desorption from complex ionic crystals. J. Electron. Mater. 26, 1335–1341 (1997). https://doi.org/10.1007/s11664-997-0081-0

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  • DOI: https://doi.org/10.1007/s11664-997-0081-0

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