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

作者：Lechner B A J^*; Hedgeland H; Allison W; Ellis J; Jardine A P

来源：Review of Scientific Instruments, 2013, 84(2): 026105.

DOI：10.1063/1.4791929

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.

• 出版日期2013-2