Document Detail


Continuous-wave EPR at 275GHz: Application to high-spin Fe(3+) systems.
MedLine Citation:
PMID:  21444227     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The 275GHz electron-paramagnetic-resonance spectrometer we reported on in 2004 has been equipped with a new probe head, which contains a cavity especially designed for operation in continuous-wave mode. The sensitivity and signal stability that is achieved with this new probe head is illustrated with 275GHz continuous-wave spectra of a 1mM frozen solution of the complex Fe(III)-ethylenediamine tetra-acetic acid and of 10mM frozen solutions of the protein rubredoxin, which contains Fe(3+) in its active site, from three different organisms. The high quality of the spectra of the rubredoxins allows the determination of the zero-field-splitting parameters with an accuracy of 0.5GHz. The success of our approach results partially from the enhanced absolute sensitivity, which can be reached using a single-mode cavity. At least as important is the signal stability that we were able to achieve with the new probe head.
Authors:
G Mathies; H Blok; J A J M Disselhorst; P Gast; H van der Meer; D M Miedema; R M Almeida; J J G Moura; W R Hagen; E J J Groenen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-26
Journal Detail:
Title:  Journal of magnetic resonance (San Diego, Calif. : 1997)     Volume:  -     ISSN:  1096-0856     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9707935     Medline TA:  J Magn Reson     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011 Elsevier Inc. All rights reserved.
Affiliation:
Department of Molecular Physics, Huygens Laboratory, Leiden University, The Netherlands.
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