Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 200, Issue 1, Pages 81-87Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2009.06.007
Keywords
ENDOR; Pulse EPR; ENDOR resonator; Q-band probehead; Large sample resonator
Funding
- ETH Zurich
- Swiss National Foundation
- NCCR Nanoscale Science
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The construction and performance of a cryogenic 35 GHz Pulse electron nuclear double resonance (ENDOR) probehead for large samples is presented. The resonator is based on a rectangular TE102 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 2-180 MHz. 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. (C) 2009 Elsevier Inc. All rights reserved.
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