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Increased photoelectron transmission in High-pressure photoelectron spectrometers using "swift acceleration"
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2015 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 785, 191-196 p.Article in journal (Refereed) Published
Abstract [en]

A new operation mode of a HPXPS (high-pressure X-ray photoelectron spectroscopy) analyzer is evaluated on a HPXPS system fitted with an Al K alpha X-ray source. A variety of metal foil samples (gold, silver and copper) were measured in different sample gas environments (N-2 and H2O), and a front aperture diameter of 0.8 mm. The new design concept is based upon "swiftly" accelerating the photoelectrons to kinetic energies of several keV after they pass the analyzer front aperture. Compared to the standard mode, in which the front section between the two first apertures is field-free, this gives a wider angular collection and a lower tendency for electron losses in collisions with gas molecules within the analyzer. With the swift-acceleration mode we attain, depending on the experimental conditions, up to about 3 times higher peak intensities in vacuum and about 10 to 20 times higher peak intensities in the 6-9 mbar regime, depending on kinetic energy. These experimental findings agree well with simulated transmission functions for the analyzer. The new mode of operation enables faster data acquisition than the standard mode of operation, particularly valuable in a home laboratory environment. Further demonstrations of performance are highlighted by measurements of the valence band structure in dye sensitized solar cell photoelectrodes under a 2 mbar H2O atmosphere, a molecularly modified surface of interest in photoelectrochemical devices.

Place, publisher, year, edition, pages
2015. Vol. 785, 191-196 p.
Keyword [en]
High-pressure X-ray photoelectron spectroscopy, Photoelectron spectroscopy, Scientific instrumentation, Spectrometer, Charge particle analyser
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-252668DOI: 10.1016/j.nima.2015.02.047ISI: 000352815400029OAI: oai:DiVA.org:uu-252668DiVA: diva2:814335
Funder
VINNOVASwedish Research Council, 2012-4721Swedish Research Council, 2012-4681
Available from: 2015-05-26 Created: 2015-05-11 Last updated: 2017-12-04Bibliographically approved

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Eriksson, Susanna KaufmannHahlin, MariaSiegbahn, HansRensmo, Håkan

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Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Condensed Matter Physics

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