Vie de l'Institut - Institut de minéralogie et de physique des milieux condensés

Institut de Minéralogie et de Physique des Milieux Condensés

Université P. et M. Curie, 4, Place Jussieu, 75005 Paris

Salle de Conférence (401),

4ème étage, Tour 23, couloir 22-23

 X-ray spectroscopy: New developments in theory and experiment

Frank de Groot
Debye Institute of Nanomaterials Science
(Utrecht University, Netherlands)

http://www.anorg.chem.uu.nl/people/staff/FrankdeGroot/index.htm

 
New developments in x-ray absorption spectroscopy and resonant inelastic x-ray scattering will be discussed. First an introduction is given of x-ray absorption spectroscopy, including the multiplet interpretation of XAS spectral shapes [1,2]. Examples are given from the use of X-ray magnetic circular dichroism (X-MCD) [3] and the effects of pi-bonding on iron complexes [4]. With the recent developments in nanoreactors, scanning transmission x-ray microscopy (STXM) experiments make it possible to follow metal L edges at 1 bar and 500 C, with a spatial resolution of 20 nm. This allows the in-situ spectroscopic study of a single nanoparticle (in action) [5]. A comparison will be made between x-ray and electron spectromicroscopy and some future directions of spectromicroscopy of nanomaterials are given. [6,7]. The last part of the talk deals with the role of resonant inelastic x-ray scattering (RIXS) to unravel the nature of the surface of small metal nanoparticles.


[1]   Core Level Spectroscopy of Solids
Frank de Groot and Akio Kotani (Taylor & Francis CRC press, 2008)

[2]   Download the x-ray spectroscopy simulation software at  http://www.anorg.chem.uu.nl/CTM4XAS/

[3] P. Gambardella et al. Nature Materials 8, 189 (2009)

[4] R. Hocking et al. J. Am. Chem. Soc. 128, 10442 (2006) & 129, 113 (2007)

[5] E. de Smit et al. Nature 456, 222 (2008)

[6] F.M.F. de Groot et al. ChemPhysChem 11, 951 (2010)
[7] M. van Schooneveld et al. Nature Nanotechnology 5, 538 (2010)