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Titolo:
Two-pulse echo experiments in the spectral diffusion regime
Autore:
Berg, MA; Rector, KD; Fayer, MD;
Indirizzi:
Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA Univ S Carolina Columbia SC USA 29208 m & Biochem, Columbia, SC 29208 USA Stanford Univ, Dept Chem, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 iv, Dept Chem, Stanford, CA 94305 USA
Titolo Testata:
JOURNAL OF CHEMICAL PHYSICS
fascicolo: 8, volume: 113, anno: 2000,
pagine: 3233 - 3242
SICI:
0021-9606(20000822)113:8<3233:TEEITS>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
VISCOELASTIC CONTINUUM MODEL; OPTICAL DEPHASING MEASUREMENTS; LOW-TEMPERATURE GLASS; MULTIPLE TIME SCALES; VIBRATIONAL ECHO; NONPOLAR SOLVATION; PHOTON-ECHOES; MYOGLOBIN-CO; PROTEIN DYNAMICS; RAMAN ECHOES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Berg, MA Univ S Carolina, Dept Chem & Biochem, Columbia, SC 29208 USA UnivS Carolina Columbia SC USA 29208 em, Columbia, SC 29208 USA
Citazione:
M.A. Berg et al., "Two-pulse echo experiments in the spectral diffusion regime", J CHEM PHYS, 113(8), 2000, pp. 3233-3242

Abstract

The two-pulse echo sequence is examined for the case in which the frequency modulation time tau(m) of the transition is intermediate between the wellknown limiting cases of very fast modulation (motional narrowing) and veryslow or static modulation (inhomogeneous broadening). Within this spectraldiffusion regime, the interpretation of the echo decay differs markedly from standard treatments. If the frequency-frequency correlation function initially decays as 1-t(beta), the echo decay time T-E is proportional to tau(m)(beta/(beta+2)). These results reduce to those of Yan and Mukamel [J. Chem. Phys. 94, 179 (1991)] for beta = 1. Drawing on a viscoelastic model, thetheoretical results are compared to viscosity and temperature dependent vibrational echo experiments on myoglobin-CO. A tau(m)(1/3) dependence is observed, as is predicted for an exponential decay of the frequency-frequency correlation function. (C) 2000 American Institute of Physics. [S0021-9606(00)51132-5].

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Documento generato il 30/11/20 alle ore 03:34:52