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  High field electron paramagnetic resonance spectroscopy under ultrahigh vacuum conditions - A multipurpose machine to study paramagnetic species on well defined single crystal surfaces

Rocker, J., Cornu, D., Kieseritzky, E., Seiler, A., Bondarchuk, O., Hänsel-Ziegler, W., et al. (2014). High field electron paramagnetic resonance spectroscopy under ultrahigh vacuum conditions - A multipurpose machine to study paramagnetic species on well defined single crystal surfaces. Review of Scientific Instruments, 85(8): 083903. doi:10.1063/1.4893729.

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 Creators:
Rocker, Jan1, Author           
Cornu, Damien1, Author           
Kieseritzky, Esther1, Author           
Seiler, Anja1, 2, Author           
Bondarchuk, Oleksandr1, 3, Author           
Hänsel-Ziegler, Werner1, Author           
Risse, Thomas1, 4, Author           
Freund, Hans-Joachim1, Author           
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Laboratorium für Applikationen der Synchrotronstrahlung, KIT Campus Süd, Kaiserstr. 12, 76131 Karlsruhe, Germany, ou_persistent22              
3CIC energiGUNE, Parque Tecnologico, C/Albert Einstein 48, CP 01510 Minano (Alava), Spain, ou_persistent22              
4Institut für Chemie und Biochemie - Physikalische und Theoretische Chemie, Freie Universität Berlin, ou_persistent22              

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Free keywords: Vacuum chambers Electron paramagnetic resonance spectroscopy Mirrors Paramagnetism Magnets
 Abstract: A new ultrahigh vacuum (UHV) electron paramagnetic resonance (EPR) spectrometer operating at 94 GHz to investigate paramagnetic centers on single crystal surfaces is described. It is particularly designed to study paramagnetic centers on well-defined model catalysts using epitaxial thin oxide films grown on metal single crystals. The EPR setup is based on a commercial Bruker E600 spectrometer, which is adapted to ultrahigh vacuum conditions using a home made Fabry Perot resonator. The key idea of the resonator is to use the planar metal single crystal required to grow the single crystalline oxide films as one of the mirrors of the resonator. EPR spectroscopy is solely sensitive to paramagnetic species, which are typically minority species in such a system. Hence, additional experimental characterization tools are required to allow for a comprehensive investigation of the surface. The apparatus includes a preparation chamber hosting equipment, which is required to prepare supported model catalysts. In addition, surface characterization tools such as low energy electron diffraction (LEED)/Auger spectroscopy, temperature programmed desorption (TPD), and infrared reflection absorption spectroscopy (IRAS) are available to characterize the surfaces. A second chamber used to perform EPR spectroscopy at 94 GHz has a room temperature scanning tunneling microscope attached to it, which allows for real space structural characterization. The heart of the UHV adaptation of the EPR experiment is the sealing of the Fabry-Perot resonator against atmosphere. To this end it is possible to use a thin sapphire window glued to the backside of the coupling orifice of the Fabry Perot resonator. With the help of a variety of stabilization measures reducing vibrations as well as thermal drift it is possible to accumulate data for a time span, which is for low temperature measurements only limited by the amount of liquid helium. Test measurements show that the system can detect paramagnetic species with a density of approximately 5 × 1011 spins/cm2, which is comparable to the limit obtained for the presently available UHV-EPR spectrometer operating at 10 GHz (X-band). Investigation of electron trapped centers in MgO(001) films shows that the increased resolution offered by the experiments at W-band allows to identify new paramagnetic species, that cannot be differentiated with the currently available methodology.

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Language(s): eng - English
 Dates: 2014-06-112014-08-112014-08-262014-08
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.4893729
 Degree: -

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Title: Review of Scientific Instruments
Source Genre: Journal
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Publ. Info: Melville, NY : AIP Publishing
Pages: - Volume / Issue: 85 (8) Sequence Number: 083903 Start / End Page: - Identifier: ISSN: 0034-6748
CoNE: https://pure.mpg.de/cone/journals/resource/991042742033452