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Thermal energy 3He spin-echo spectrometer for ultrahigh resolution surface dynamics measurements

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6 Author(s)
Fouquet, P. ; Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom ; Jardine, A.P. ; Dworski, S. ; Alexandrowicz, G.
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We present details of a 3He spin-echo spectrometer, designed to make possible a wide range of new surface dynamics measurements. The apparatus operates at beam energy of 8 meV, sufficiently high to enable processes such as surface Bragg diffraction and permit inelastic and quasielastic scattering measurements at up to momentum transfers of about 4 Å-1. We describe the requirements for the machine, details of the major components used to fulfil these requirements, and the performance of the overall spectrometer. The machine can access a Fourier time range of 0.01 ps–1 ns, and yields a resolution of 3 μeV for inelastic spectrum reconstruction, although under favorable circumstances quasielastic broadenings as narrow as 20 neV can be resolved, allowing correspondingly slower processes to be studied.

Published in:

Review of Scientific Instruments  (Volume:76 ,  Issue: 5 )

Date of Publication:

May 2005

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