Surface optical reflectance combined with x-ray techniques during gas-surface interactions

High energy surface x-ray diffraction (HESXRD), x-ray reflectivity (XRR), mass spectrometry (MS) and surface optical reflectance (SOR) have been combined to simultaneously obtain sub-second information on the surface structure and morphology from a Pd(100) model catalyst during in situ oxidation at...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2020-05, Vol.53 (22), p.224001
Main Authors: Albertin, S, Gustafson, J, Zhou, J, Pfaff, S, Shipilin, M, Blomberg, S, Merte, L R, Gutowski, O, Dippel, A-C, Zetterberg, J, Lundgren, E, Hejral, U
Format: Article
Language:English
Subjects:
Atom and Molecular Physics and Optics
Atom- och molekylfysik och optik
Chemical Sciences
Condensed Matter Physics
Den kondenserade materiens fysik
Fysik
high energy surface x-ray diffraction
Kemi
Materialkemi
Materials Chemistry
Natural Sciences
Naturvetenskap
oxidation
Physical Sciences
surface optical reflectance
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:High energy surface x-ray diffraction (HESXRD), x-ray reflectivity (XRR), mass spectrometry (MS) and surface optical reflectance (SOR) have been combined to simultaneously obtain sub-second information on the surface structure and morphology from a Pd(100) model catalyst during in situ oxidation at elevated temperatures and pressures resulting in Pd bulk oxide formation. The results show a strong correlation between the HESXRD and SOR signal intensities during the experiment, enabling phase determination and a time-resolved thickness estimation of the oxide by HESXRD, complemented by XRR measurements. The experiments show a remarkable sensitivity of the SOR to changes in the surface phase and morphology, in particular to the initial stages of oxidation/reduction. The data imply that SOR can detect the formation of an ultrathin PdO surface oxide layer of only 2-3 Å thickness.
ISSN:0022-3727
1361-6463
1361-6463
DOI:10.1088/1361-6463/ab77df