ELFT HÍRADÓ

[VANKO Gyorgy <vanko.gyorgy AT wigner.mta.hu>]

Kedves Kollégák!

2014. május 15-én 10 órakor Michael Krisch (a European Synchrotron 
Radiation Facility vezető kutatója, az ELI-ALPS tudományos tanácsának 
tagja) szemináriumot tart az MTA Wigner FK III. épületi tanácstemében

25 Years of Phonon Studies with X-Rays:
What did We Learn and Where do We Go?

címmel, amelyre minden érdeklődőt szeretettel várunk.

Az előadás összefoglalója a levél végén olvasható.

Üdvözlettel: Vankó György.
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 Gyorgy Vanko
 Wigner Research Centre for Physics, Hung. Acad. Sci.
 H-1525 Budapest, P.O.B. 49., Hungary
 Phone: +36-1-392-22-22 /ext. 1736
 Fax  : +36-1-395-91-51   http://mffo.rmki.kfki.hu/X-ray_spectroscopy
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The study of phonon dispersion in condensed matter at momentum transfers, 
Q, and energies, E, characteristic of collective atom motions, provides 
insight into many physical properties such as elasticity, interatomic 
forces, structural phase stability and transitions, anharmonicity, and 
electron correlation. Techniques such as Brillouin and Raman light 
scattering, as well as infrared spectroscopy, are limited to momentum 
transfers close to zero and consequently probe the dynamics over 
macroscopic length scales. Access to the mesoscopic and microscopic region 
is primarily provided by inelastic neutron scattering (INS) or inelastic 
x-ray scattering (IXS).

The uniqueness of IXS is primarily due to two main aspects: i) there is no 
fundamental restriction on the energy-momentum transfer region to be 
explored, and ii) materials in very small quantities and at very high 
pressures can be studied. Since pioneering work in the late 1980s [1,2], 
IXS has evolved into a mature technique and has contributed to the 
advancement of knowledge in different scientific disciplines ranging from 
solid-state physics to planetary science [3-7]. The present contribution 
shall provide a representative overview of the main past achievements and 
project onto possible future avenues.


References
[1] E. Burkel, J. Peisl, and B. Dorner; Europhysics Lett. 3 (8), 957 (1987).
[2] B. Dorner, E. Burkel, Th. Illini, and J. Peisl; Z. Phys. B . Condensed 
Matter 69, 179 (1987).
[3] M. Krisch and F. Sette, in Light Scattering in Solids, Novel Materials 
and Techniques, Topics in Applied Physics 108, 317-369, Springer-Verlag 
Berlin Heidelberg (2007). Inelastic X-Ray Scattering from Phonons.
[4] V.M. Giordano, M. Krisch, and G. Monaco; J. Synchr. Radiation 16, 707 
(2009).
Phonon spectroscopy at high pressure by inelastic x-ray scattering.
[5] M. d.Astuto and M. Krisch; J. Phys. IV, 487 (2010)
High resolution inelastic X-ray scattering from thermal collective 
excitations
[6] A. Bosak, I. Fischer, and M. Krisch, in Thermodynamic Properties of 
Solids. Experiment and Modeling, Eds. S.L. Chaplot, R. Mittal, N. 
Choudhury. Wiley-VCH Verlag Weinheim, Germany (2010) 342 p. ISBN: 
978-3-527-40812-2, Phonon spectroscopy of polycrystalline materials using 
inelastic x-ray scattering
[7] A. Bosak, and M. Krisch, in Modern Experimental Techniques, Eds. B. 
Murphy, O.H. Seeck. Pan Stanford Publishing, 300 p. ISBN: 978-9814303590 
(2012), Inelastic x-ray scattering from phonons