| Literature DB >> 19581114 |
René Tschaggelar1, Besnik Kasumaj, Maria Grazia Santangelo, Jörg Forrer, Patrik Leger, Henry Dube, François Diederich, Jeffrey Harmer, Rolf Schuhmann, Inés García-Rubio, Gunnar Jeschke.
Abstract
The construction and performance of a cryogenic 35GHz pulse electron nuclear double resonance (ENDOR) probehead for large samples is presented. The resonator is based on a rectangular TE(102) cavity in which the radio frequency (rf) B(2)-field is generated by a two turn saddle ENDOR coil crossing the resonator along the sample axis with minimal distance to the sample tube. An rf power efficiency factor is used to define the B(2)-field strength per square-root of the transmitted rf power over the frequency range 2-180MHz. The distributions of the microwave B(1)- and E(1)-field, and the rf B(2)-field are investigated by electromagnetic field calculations. All dielectrics, the sample tube, and coupling elements are included in the calculations. The application range of the probehead and the advantages of using large sample sizes are demonstrated and discussed on a number of paramagnetic samples containing transition metal ions.Entities:
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Year: 2009 PMID： 19581114 DOI： 10.1016/j.jmr.2009.06.007
Source DB: PubMed Journal: J Magn Reson ISSN： 1090-7807 Impact factor: 2.229