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Pulsed Electron-Nuclear Double Resonance (ENDOR) at 140 GHz

✍ Scribed by M. Bennati; C.T. Farrar; J.A. Bryant; S.J. Inati; V. Weis; G.J. Gerfen; P. Riggs-Gelasco; J. Stubbe; R.G. Griffin

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
144 KB
Volume
138
Category
Article
ISSN
1090-7807

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✦ Synopsis

We describe a spectrometer for pulsed ENDOR at 140 GHz, which is based on microwave IMPATT diode amplifiers and a probe consisting of a TE 011 cavity with a high-quality resonance circuit for variable radiofrequency irradiation. For pulsed EPR we obtain an absolute sensitivity of 3 Ψ‹ 10 9 spins/Gauss at 20 K. The performance of the spectrometer is demonstrated with pulsed ENDOR spectra of a standard bis-diphenylene-phenyl-allyl (BDPA) doped into polystyrene and of the tyrosyl radical from E. coli ribonucleotide reductase (RNR). The EPR spectrum of the RNR tyrosyl radical displays substantial g-anisotropy at 5 T and is used to demonstrate orientation-selective Davies-ENDOR.

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