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- W1992156184 abstract "Analysis of the detected Fe ion charge states from laser-assisted field evaporation of magnetite (Fe3O4) reveals unexpected trends as a function of laser pulse energy that break from conventional post-ionization theory for metals. For Fe ions evaporated from magnetite, the effects of post-ionization are partially offset by the increased prevalence of direct evaporation into higher charge states with increasing laser pulse energy. Therefore, the final charge state is related to both the field strength and the laser pulse energy, despite those variables themselves being intertwined when analyzing at a constant detection rate. Comparison of data collected at different base temperatures also shows that the increased prevalence of Fe2+ at higher laser energies is possibly not a direct thermal effect. Conversely, the ratio of 16O+:(16O2+ + 16O+) is well correlated with field strength and unaffected by laser pulse energy on its own, making it a better overall indicator of the field evaporation conditions. Plotting the normalized field strength versus laser pulse energy also elucidates a non-linear dependence, in agreement with the previous observations on semiconductors, which suggests field-dependent laser absorption efficiency. Together these observations demonstrate that the field evaporation process for laser-pulsed oxides exhibits fundamental differences from metallic specimens that cannot be completely explained by post-ionization theory. Further theoretical studies, combined with detailed analytical observations, are required to understand fully the field evaporation process of non-metallic samples." @default.
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- W1992156184 date "2014-12-15" @default.
- W1992156184 modified "2023-10-18" @default.
- W1992156184 title "Applicability of post-ionization theory to laser-assisted field evaporation of magnetite" @default.
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- W1992156184 doi "https://doi.org/10.1063/1.4904802" @default.
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