Surface optical reflectance combined with x-ray techniques during gas-surface interactions
(2020) In Journal of Physics D: Applied Physics 53(22).- Abstract
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... (More)
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.
(Less)
- author
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- high energy surface x-ray diffraction, oxidation, Pd(100), surface optical reflectance
- in
- Journal of Physics D: Applied Physics
- volume
- 53
- issue
- 22
- article number
- 224001
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85084672771
- ISSN
- 0022-3727
- DOI
- 10.1088/1361-6463/ab77df
- project
- Combined techniques for studies of catalysis
- language
- English
- LU publication?
- yes
- id
- d7504455-c7dc-4408-a44e-13b6d588378c
- date added to LUP
- 2020-06-02 15:55:11
- date last changed
- 2024-02-16 15:30:54
@article{d7504455-c7dc-4408-a44e-13b6d588378c, abstract = {{<p>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.</p>}}, author = {{Albertin, S. and Gustafson, J. and Zhou, J. and Pfaff, S. and Shipilin, M. and Blomberg, S. and Merte, L. R. and Gutowski, O. and Dippel, A. C. and Zetterberg, J. and Lundgren, E. and Hejral, U.}}, issn = {{0022-3727}}, keywords = {{high energy surface x-ray diffraction; oxidation; Pd(100); surface optical reflectance}}, language = {{eng}}, number = {{22}}, publisher = {{IOP Publishing}}, series = {{Journal of Physics D: Applied Physics}}, title = {{Surface optical reflectance combined with x-ray techniques during gas-surface interactions}}, url = {{http://dx.doi.org/10.1088/1361-6463/ab77df}}, doi = {{10.1088/1361-6463/ab77df}}, volume = {{53}}, year = {{2020}}, }