An elastic recoil time of flight spectrometer for material analysis
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Date
1994-02-10
Journal Title
Journal ISSN
Volume Title
Publisher
Australian and New Zealand Institutes of Physics
Abstract
A heavy ion elastic recoil time of flight (ERTOF) spectrometer has been built on the ion beam analysis (1BA) beam line of the 8 MV tandem particle accelerator at the Australian Nuclear Science and Technology Organisation (ANSTO). The spectrometer consists of two electrostatic mirror time detectors, as described in the literature by Whitlow et. al. and Busch et al. at the forward scattering angle of 45°, and an ion-implanted surface barrier energy detector. The flight length of 750mm gives a typical timing resolution of a few
hundred pico-seconds. The use of high energy heavy ions in recoil spectrometry is ideally suited to the
analysis of light ions in heavy matrices, though the analysis of recoil spectra presents some ambiguity due to the overlap of individual depth profiles. An HRTOF spectrometer, with incident 77MeV 127 I 10+ as designed here, allows individual depth profiling of most elements contained within the matrix, even those in close proximity in the periodic table, therefore providing an unambiguous profile and greater certainty in sample analysis. This paper will outline the design and principles of the ERTOF spectrometer built on the IBA beam line at ANSTO. The application of this technique to materials analysis and such examples as YBCO superconductors and AlGaAs semiconductors systems will also be presented.
Description
Keywords
ANSTO, Design, Elastic scattering, Heavy ion spectrometers, Iodine 127 beams, MeV range, Scattering, Spectrometers
Citation
Martin, J. W., Cohen, D. D., Dytlewski, N., Russell, G. J., & Garton, D. B. (1994). An elastic recoil time of flight spectrometer for material analysis. Poster presented to the 18th Annual Condensed Matter Physics Meeting, Charles Sturt University, Wagga Wagga, NSW, 9-11 February 1994.