Vibrational studies using neutrons
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Date
2016-02-04
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Australian Institute of Physics
Abstract
Several neutron spectrometers are available for use at the Bragg Institute. In particular a low energy band pass neutron spectrometer that operates in the range of ~ 50 - 1200 cm−1 has very recently been commissioned and first experiments run on TAIPAN. The so-called Beryllium-filter spectrometer is predominantly used to obtain vibrational density of states spectra from those materials that contain hydrogen, thus making this instrument especially important in the chemical, biological, geological and environmental sciences. In many aspects a neutron spectrum obtained using the Beryllium-filter spectrometer is very similar to spectra obtained in the far-infrared or terahertz regime making neutron spectroscopy a complementary technique to other spectroscopies such as photon (electromagnetic radiation)-based techniques. The neutron’s properties are unique amongst other fundamental probes like light, such as outstanding materials penetrability, isotopic sensitivity, magnetic sensitivity and lack of vibrational selection rules. Furthermore because hydrogen possesses a large incoherent scattering cross-section much of the observed vibrational modes are molecular in origin.
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Keywords
Australia, Bosons, Calculation methods, Elements, Energy levels, Excited states, Particles, Measuring instruments, Metals, Radiations, Spectrometers, Testing, ANSTO
Citation
Stampfl, A. (2016). Vibrational studies using neutrons. Paper presented to the 40th Annual Condensed Matter and Materials Meeting, Charles Sturt University, Wagga Wagga, NSW, 2nd February – 5th February 2016, (pp. 111). Retrieved from: https://physics.org.au/wp-content/uploads/cmm/2016/Wagga_2016_Conference_Handbook.pdf