DPG Phi
Verhandlungen
Verhandlungen
DPG

Regensburg 1998 – scientific programme

Parts | Days | Selection | Search | Downloads | Help

O: Oberflächenphysik

O 34: Poster (II)

O 34.24: Poster

Thursday, March 26, 1998, 20:00–22:30, Bereich C

New Experimental Technique: X-Ray Absorption Spectroscopy for in situ Studies in the Soft X-Ray Range (250 eV hν 1000 eV) under Reaction Conditions — •A. Knop-Gericke, M. Hävecker, and Th. Schedel–Niedrig — Fritz–Haber–Institut der MPG, Faradayweg 4–6, D-14195 Berlin

A novel tank reactor equipped with total electron yield (TEY) detectors was designed and constructed for in situ X-ray absorption spectroscopy (XAS) in the soft X-ray range (250 eV ≤ hν ≤ 1000 eV) under elevated pressures (up to 20 mbar) and sample temperatures (up to 900 K). This allows, for the first time, XAS studies in the TEY mode at the K-absorption edges of the low atomic number elements like carbon, nitrogen and oxygen with high surface sensitivity. Furthermore, the gas phase XAS and the surface-related XAS of the catalyst can be collected simultaniously in order to correlate the gas/solid reaction rate with the electronic structure of the sample surface and near-surface region. This work presents the experimental technique and the oxygen K- and copper L2,3 X-ray absorption near-edge structures (XANES) of Cu(poly) obtained under various gas environments and reaction temperatures.

(A. Knop–Gericke, M. Hävecker, Th. Neisius and Th. Schedel–Niedrig, Nucl. Instr. Meth., submitted 10/97)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 1998 > Regensburg