Pulsed electron-nuclear double resonance (ENDOR) at 140 GHz.
J Magn Reson
; 138(2): 232-43, 1999 Jun.
Article
en En
| MEDLINE
| ID: mdl-10341127
ABSTRACT
We describe a spectrometer for pulsed ENDOR at 140 GHz, which is based on microwave IMPATT diode amplifiers and a probe consisting of a TE011 cavity with a high-quality resonance circuit for variable radiofrequency irradiation. For pulsed EPR we obtain an absolute sensitivity of 3x10(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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Banco de datos:
MEDLINE
Asunto principal:
Ribonucleótido Reductasas
/
Espectroscopía de Resonancia por Spin del Electrón
Tipo de estudio:
Diagnostic_studies
/
Prognostic_studies
Idioma:
En
Año:
1999
Tipo del documento:
Article