ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
A probehead employing interchangeable loop-gap resonators and rf coils for multifrequency EPR/ENDOR spectroscopy from 1 to 10 GHz is described. A precision coupling mechanism allows accurate magnetic coupling of the microwaves to the resonators. The Rexolite© support of the resonator acts as a spool for the ENDOR coil. rf fields of 1.0 mT are generated. The coil and resonator can be easily changed to cover the range of 1–10 GHz. Liquid-phase ENDOR spectra of the stable free-radical galvanoxyl and of the spin label TEMPONE (4-oxo-2,2,6,6-tetramethyl-l-piperidine-N-oxyl) dissolved in n-heptane are shown. The ENDOR enhancement for nitrogen from TEMPONE is 15 times larger at 2.3 than at 9.3 GHz due to the rf enhancement.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1144747
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