Note: a new design for a low-temperature high-intensity helium beam source

A high-intensity supersonic beam source is a key component of any atom scattering instrument, affecting the sensitivity and energy resolution of the experiment. We present a new design for a source which can operate at temperatures as low as 11.8 K, corresponding to a beam energy of 2.5 meV. The new...

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Bibliographic Details
Published in:Review of scientific instruments 2013-02, Vol.84 (2), p.026105-026105
Main Authors: Lechner, B A J, Hedgeland, H, Allison, W, Ellis, J, Jardine, A P
Format: Article
Language:English
Subjects:
Accessibility
Beams (radiation)
Benzene
Helium
Nanocomposites
Nanomaterials
Nanostructure
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Summary:A high-intensity supersonic beam source is a key component of any atom scattering instrument, affecting the sensitivity and energy resolution of the experiment. We present a new design for a source which can operate at temperatures as low as 11.8 K, corresponding to a beam energy of 2.5 meV. The new source improves the resolution of the Cambridge helium spin-echo spectrometer by a factor of 5.5, thus extending the accessible timescales into the nanosecond range. We describe the design of the new source and discuss experiments characterizing its performance. Spin-echo measurements of benzene/Cu(100) illustrate its merit in the study of a typical slow-moving molecular adsorbate species.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4791929