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Proceedings Paper

Characterization of the energy and spatial distribution of neutrals produced by laser ablation
Author(s): Paul T. McCombes; I. S. Borthwick; R. Jennings; A. P. Land; Kenneth W. D. Ledingham; Raghunandan Prasad Singhal; M. Towrie
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Paper Abstract

A Resonant ionisation Mass Spectrometer has been used to characterise the neutrals ablated by a Nd:YAG laser. The neutrals were post ablation ionised both resonantly and non-resonantly and the signals produced in the spectrometer examined. The delay time between ablation and ionisation was varied and experimental energy distributions determined. The shape of the distribution from a calcium sample has been shown to be independent of the wavelength of the ablation laser at low ablation powers. The results were theoretically modelled to a Maxwell-Boltzman distribution and good agreement was obtained indicating that for calcium a thermal process is mainly responsible for the ablated neutrals. Initial data have also been obtained for lead and gold with similar results, although for gold several unexplained sharp spikes in the spectrum were evident. In addition the broad thermal distribution for gold was considerably wider than that for lead.

Paper Details

Date Published: 1 July 1990
PDF: 11 pages
Proc. SPIE 1208, Laser Photoionization and Desorption Surface Analysis Techniques, (1 July 1990); doi: 10.1117/12.17872
Show Author Affiliations
Paul T. McCombes, Univ. of Glasgow (United Kingdom)
I. S. Borthwick, Univ. of Glasgow (United Kingdom)
R. Jennings, Univ. of Glasgow (United Kingdom)
A. P. Land, Univ. of Glasgow (United Kingdom)
Kenneth W. D. Ledingham, Univ. of Glasgow (United Kingdom)
Raghunandan Prasad Singhal, Univ. of Glasgow (United Kingdom)
M. Towrie, Univ. of Glasgow (United Kingdom)

Published in SPIE Proceedings Vol. 1208:
Laser Photoionization and Desorption Surface Analysis Techniques
Nicholas S. Nogar, Editor(s)

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