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Increased photoelectron transmission in High-pressure photoelectron spectrometers using "swift acceleration"
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Molekyl- och kondenserade materiens fysik.
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2015 (Engelska)Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 785, s. 191-196Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
2015. Vol. 785, s. 191-196
Nyckelord [en]
High-pressure X-ray photoelectron spectroscopy, Photoelectron spectroscopy, Scientific instrumentation, Spectrometer, Charge particle analyser
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Den kondenserade materiens fysik
Identifikatorer
URN: urn:nbn:se:uu:diva-252668DOI: 10.1016/j.nima.2015.02.047ISI: 000352815400029OAI: oai:DiVA.org:uu-252668DiVA, id: diva2:814335
Forskningsfinansiär
VINNOVAVetenskapsrådet, 2012-4721Vetenskapsrådet, 2012-4681Tillgänglig från: 2015-05-26 Skapad: 2015-05-11 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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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
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