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Quadrupole mass spectrometry and time-of-flight analysis of ions resulting from 532 nm pulsed laser ablation of Ni, Al, and ZnO targets
University of Bristol, UK.
2008 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 103, no 9, article id 093301Article in journal (Refereed) Published
Abstract [en]

This work describes the design and validation of an instrument to measure the kinetic energies of ions ejected by the pulsed laser ablation (PLA) of a solid target. Mass spectra show that the PLA of Ni, Al, and ZnO targets, in vacuum, using the second harmonic of a Nd:YAG laser (532 nm, pulse duration similar to 10 ns) generates abundant X(n+) ions (n <= 3 for Ni, <= 2 for Al, <= 3 and <= 2 for Zn and O respectively from ZnO). Ions are selected by their mass/charge (m/z) ratio prior to the determination of their times of flight. PLA of Ni has been studied in most detail. The mean velocities of ablated Ni(n+) ions are shown to follow the trend v(Ni(3+))>v(Ni(2+))>v(Ni(+)). Data from Ni(2+) and Ni(3+) are fitted to shifted Maxwellian functions and agree well with a model which assumes both thermal and Coulombic contributions to ion velocities. The dependence of ion velocities on laser pulse energy (and fluence) is investigated, and the high energy data are shown to be consistent with an effective accelerating voltage of similar to 90 V within the plume. The distribution of velocities associated with Ni(3+) indicates a population at cooler temperature than Ni(2+).

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2008. Vol. 103, no 9, article id 093301
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-225480DOI: 10.1063/1.2903604ISI: 000255983200020Scopus ID: 2-s2.0-43949088538OAI: oai:DiVA.org:kth-225480DiVA, id: diva2:1195450
Note

QC 20180405

Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-04-05Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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Output format
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