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Title: Quadrupole mass spectrometry and time-of-flight analysis of ions resulting from 532 nm pulsed laser ablation of Ni, Al, and ZnO targets

Abstract

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 {approx}10 ns) generates abundant X{sup 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{sup n+} ions are shown to follow the trend v(Ni{sup 3+})>v(Ni{sup 2+})>v(Ni{sup +}). Data from Ni{sup 2+} and Ni{sup 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 {approx}90 V within the plume. The distribution of velocities associated with Ni{sup 3+} indicates a population at cooler temperature than Ni{supmore » 2+}.« less

Authors:
; ; ;  [1]
  1. School of Chemistry, University of Bristol, Bristol BS8 1TS (United Kingdom)
Publication Date:
OSTI Identifier:
21137233
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 103; Journal Issue: 9; Other Information: DOI: 10.1063/1.2903604; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABLATION; ALUMINIUM; ELECTRIC POTENTIAL; HEAT EXCHANGERS; ION MICROPROBE ANALYSIS; KINETIC ENERGY; MASS SPECTRA; MASS SPECTROSCOPY; NEODYMIUM LASERS; NICKEL; NICKEL IONS; PLUMES; PULSES; QUADRUPOLES; TIME-OF-FLIGHT METHOD; VALIDATION; ZINC OXIDES

Citation Formats

Sage, Rebecca S, Cappel, Ute B, Ashfold, Michael N. R., and Walker, Nicholas R. Quadrupole mass spectrometry and time-of-flight analysis of ions resulting from 532 nm pulsed laser ablation of Ni, Al, and ZnO targets. United States: N. p., 2008. Web. doi:10.1063/1.2903604.
Sage, Rebecca S, Cappel, Ute B, Ashfold, Michael N. R., & Walker, Nicholas R. Quadrupole mass spectrometry and time-of-flight analysis of ions resulting from 532 nm pulsed laser ablation of Ni, Al, and ZnO targets. United States. https://doi.org/10.1063/1.2903604
Sage, Rebecca S, Cappel, Ute B, Ashfold, Michael N. R., and Walker, Nicholas R. 2008. "Quadrupole mass spectrometry and time-of-flight analysis of ions resulting from 532 nm pulsed laser ablation of Ni, Al, and ZnO targets". United States. https://doi.org/10.1063/1.2903604.
@article{osti_21137233,
title = {Quadrupole mass spectrometry and time-of-flight analysis of ions resulting from 532 nm pulsed laser ablation of Ni, Al, and ZnO targets},
author = {Sage, Rebecca S and Cappel, Ute B and Ashfold, Michael N. R. and Walker, Nicholas R},
abstractNote = {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 {approx}10 ns) generates abundant X{sup 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{sup n+} ions are shown to follow the trend v(Ni{sup 3+})>v(Ni{sup 2+})>v(Ni{sup +}). Data from Ni{sup 2+} and Ni{sup 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 {approx}90 V within the plume. The distribution of velocities associated with Ni{sup 3+} indicates a population at cooler temperature than Ni{sup 2+}.},
doi = {10.1063/1.2903604},
url = {https://www.osti.gov/biblio/21137233}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 9,
volume = 103,
place = {United States},
year = {Thu May 01 00:00:00 EDT 2008},
month = {Thu May 01 00:00:00 EDT 2008}
}