[seminar] Seminar na IF-u, 4. prosinca 2014. u 15:00h

[Niksa Krstulovic]

Institut za fiziku, Bijenička cesta 46, 

predavaonica u zgradi Mladen Paić četvrtak, 4. prosinca 2014., u 15:00 sati 


ISIS, inelastic neutron scattering and TOSCA spectrometer 


Dr. Svemir Rudić 




ISIS Neutron & Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Oxfordshire, UK 

E-mail: svemir.rudic at stfc.ac.uk 







The ISIS pulsed neutron and muon source at the Rutherford Appleton Laboratory in Oxfordshire is a world-leading centre for research in the physical and life sciences. It is owned and operated by the Science and Technology Facilities Council. ISIS produces beams of neutrons and muons that allow scientists to study materials at the atomic level using a suite of instruments. TOSCA is an indirect geometry time-of-flight spectrometer optimized for the study of molecular vibrations in the solid state. It allows measurement of inelastic neutron scattering spectra in a large energy-transfer range, 0 to 8000 cm -1 , with a relative energy resolution of about 1.25% across the entire range. Recent developments include the capability to make simultaneous Raman scattering (over the range 50 - 3200 cm -1 with a resolution of 2 - 4 cm -1 ) and neutron measurements (at temperatures between 5 and 450 K). In addition to the inelastic detectors there are also two 3He filled detector tubes on the either side of the incident beam (scattering angle ~ 178°) that monitor elastically scattered neutrons and enable modest resolution, Δd/d ~ 3x10 -3 , diffraction patterns to be recorded simultaneously with the inelastic spectrum. In doing so, diffraction detectors provide a check on the crystalline phase of the material and any changes to it as a function of alternation in the experimental conditions, e.g. temperature and pressure. The spectral range on TOSCA has recently been extended to -24 cm -1 i.e. to include the elastic line. In order to achieve increased neutron intensity at the sample position Monte Carlo simulations for the development of a neutron guide on TOSCA have been performed. The installation of the neutron guide would reduce accumulation time and enable studies of smaller samples. 




Voditelji seminara IF-a: Nikša Krstulović i Osor Bari šić 







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Nikša Krstulović, PhD 
Research associate 

Institute of Physics 
Bijenicka 46 
HR-10000 Zagreb, Croatia 

Phone: 00385 1 4698 872 
00385 1 4698 851 
Fax: 00385 1 4698 889 

http://www.ifs.hr/ 
http://spectra.ifs.hr/ 
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