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- W1965684190 abstract "Time-of-flight/quadrupole mass spectrometry (TOFQMS) and photoionization studies have been performed on the ablation plume from a ZnO target to determine the mass, charge, and kinetic energies of the species ejected. Results were collected for ions and neutrals over a range of laser fluences (0.20–2.50 J/cm2) and the most prominent species were monatomic Zn and O atoms and ions; this study focuses on the energetics of Zn and Zn+. At laser fluences below ∼0.7 J/cm2, the Zn atoms had an average kinetic energy that depended logarithmically on the laser fluence, ranging from ∼1.2 eV near the desorption threshold of 0.25 J/cm2 to a maximum of ∼4 eV near the ablation threshold at 0.7 J/cm2. These kinetic energies were modeled in terms of a three-photon process at the surface. The Zn ions had similar kinetic-energy distributions to the neutrals, but of much lower intensity. At the ablation threshold, the ion signal rapidly increased and attained a peak kinetic energy of ∼17 eV. Slightly above this threshold, the ion kinetic energy broadened and separated into two distinct components centered about 17 eV. The high-energy species rapidly accelerated to over 100 eV over the 0.7–2.5 J/cm2 fluence range, while the low-energy component decelerated to an average value of ∼4 eV, limited by the presence of the slower-moving neutrals. Electron photodetachment experiments performed over this fluence range showed significant gas-phase electron–ion recombination and were used to reconcile some of the energetics observed." @default.
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- W1965684190 date "1998-05-01" @default.
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- W1965684190 title "Mass spectrometry and photoionization studies of the ablation of ZnO: ions, neutrals, and Rydbergs" @default.
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- W1965684190 doi "https://doi.org/10.1016/s0169-4332(97)00716-2" @default.
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