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Titolo:
Fourier-transform EPR at high-field/high-frequency (3.4 T/95 GHz) using broadband stochastic microwave excitation
Autore:
Fuhs, M; Prisner, T; Mobius, K;
Indirizzi:
Free Univ Berlin, Inst Expt Phys, D-14195 Berlin, Germany Free Univ Berlin Berlin Germany D-14195 pt Phys, D-14195 Berlin, Germany Univ Frankfurt, Inst Phys & Theoret Chem, D-60439 Frankfurt, Germany Univ Frankfurt Frankfurt Germany D-60439 hem, D-60439 Frankfurt, Germany
Titolo Testata:
JOURNAL OF MAGNETIC RESONANCE
fascicolo: 1, volume: 149, anno: 2001,
pagine: 67 - 73
SICI:
1090-7807(200103)149:1<67:FEAH(T>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAGNETIC-RESONANCE SPECTROSCOPY; ELECTRON-PARAMAGNETIC-RESONANCE; 95 GHZ; ENDOR SPECTROMETER; REACTION CENTERS; SYSTEM; MUTANT; ESR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Fuhs, M Free Univ Berlin, Inst Expt Phys, Arnimallee 14, D-14195 Berlin, Germany Free Univ Berlin Arnimallee 14 Berlin Germany D-14195 in, Germany
Citazione:
M. Fuhs et al., "Fourier-transform EPR at high-field/high-frequency (3.4 T/95 GHz) using broadband stochastic microwave excitation", J MAGN RES, 149(1), 2001, pp. 67-73

Abstract

Stochastic excitation with a full-width-half-maximum bandwidth of 250 MHz was used to perform Fourier-transform (FT) high-field/high-frequency electron paramagnetic resonance (EPR) at 3,4T/95 GHz (W-band). Thereby, the required microwave peak power is reduced by a factor of tau (p)/T-1 as compared to equivalent pulsed FT EPR in which the spin system with spin-lattice relaxation time T-1 is excited by a single microwave pulse of length T-p. Stochastic EPR is particularly interesting under high-field/high-frequency conditions, because the limited output power of mm microwave sources, amplifiers, and mixers makes pulse FT EPR in that frequency domain impossible, at least for the near future. On the other hand, FT spectroscopy offers several advantages compared to field-swept magnetic resonance methods, as is demonstrated by its success in NMR and X-band EPR. In this paper we describe a novel stochastic W-band microwave bridge including a bimodal induction mode transmission resonator that serves for decoupling the microwave excitation and signal detection. We report first EPR measurements and discuss experimental difficulties as well as achieved sensitivity. Moreover, we discuss future improvements and the possibility for an application of stochastic W-band FT EPR to transient signals such as those of photoexcited radical pairs in photosynthetic reaction centers. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 15:43:23