http://www.cnr.it/ontology/cnr/individuo/prodotto/ID232700
Nuclear Coherence-Transfer Echoes in Pulsed EPR (Articolo in rivista)
- Type
- Label
- Nuclear Coherence-Transfer Echoes in Pulsed EPR (Articolo in rivista) (literal)
- Anno
- 1995-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.469246 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- A. Ponti, A. Schweiger (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Laboratorium fuer Physikalische Chemie, Eidgenoessische Technische Hochschule, 8092 Zuerich, Switzerland (literal)
- Titolo
- Nuclear Coherence-Transfer Echoes in Pulsed EPR (literal)
- Abstract
- Nuclear coherence-transfer echoes created in disordered electron-nuclear spin systems by
microwave pulses are described. Once nuclear coherence is generated, a nonselective microwave p
pulse inverts the electron spins thereby interchanging nuclear coherence between the two electron
spin manifolds. This exchange refocuses the inhomogeneity of the secular part of the hyperfine
interaction. The mechanisms of echo formation for weak and strong hyperfine couplings are
explained by using simple vector diagrams. Various methods to create and detect nuclear coherence
by microwave pulses are discussed with special attention directed to the sequence
p/2-t -p/2-t1-p - t2-p/2-t. In this four-pulse experiment the nuclear coherence-transfer echo is
observed as an amplitude modulation of the electron spin echo intensity. The nuclear
coherence-transfer echo can be shifted to a time interval fully separated from the one covered by the
instrumental deadtime. The time evolution of an S51/2, I51/2 model spin system during the
four-pulse sequence is described using the density operator formalism. Several one- and
two-dimensional four-pulse experiments are discussed on this basis and their spectra are analyzed in
terms of nuclear coherence-transfer pathways. A new one-dimensional experiment based on nuclear
coherence-transfer echoes, deadtime free ESEEM by nuclear coherence-transfer echoes
~DEFENCE! is proposed to exploit undistorted electron spin echo envelope modulation ~ESEEM!
spectra. DEFENCE is a fast pulsed EPR technique that is unpretentious with respect to the required
microwave equipment. The predicted features of the nuclear coherence-transfer echoes and of the
DEFENCE approach are verified experimentally. (literal)
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- Autore CNR
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