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Titolo:
SPIN-LATTICE RELAXATION IN MOSSBAUER-SPECTRA OF METMYOGLOBIN - INVESTIGATION OF CRYSTALS, WATER AND WATER-GLYCEROL SOLUTIONS
Autore:
BIZZARRI AR; IAKOVLEVA OA; PARAK F;
Indirizzi:
TECH UNIV MUNICH,FAK PHYS E17 D-85748 GARCHING GERMANY
Titolo Testata:
Chemical physics
fascicolo: 1-3, volume: 191, anno: 1995,
pagine: 185 - 194
SICI:
0301-0104(1995)191:1-3<185:SRIMOM>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
MYOGLOBIN; HEMOGLOBIN; COMPLEXES; DYNAMICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
A.R. Bizzarri et al., "SPIN-LATTICE RELAXATION IN MOSSBAUER-SPECTRA OF METMYOGLOBIN - INVESTIGATION OF CRYSTALS, WATER AND WATER-GLYCEROL SOLUTIONS", Chemical physics, 191(1-3), 1995, pp. 185-194

Abstract

Mossbauer spectra of a polycrystalline metmyoglobin sample, metmyoglobin dissolved in 0.1 M phosphate buffer at pH = 6.8 and metmyoglobin in a water-glycerol solution have been measured. An extended theoretical approach is offered to describe the relaxation changes. The spectra are fitted in the temperature interval 4.2-40 K with due regard for the contributions both from the high spin (HS) state and low spin (LS) state of the Fe(III) ion to the hyperfine structure. It is shown that even a small amount of the LS compound affects significantly the resultant spectra. The relaxation behavior of the hyperfine spectra of the HS species is governed by the one-phonon direct processes, and the set of two relaxation constants for each sample is reported. In the case of the water-glycerol solution, the drastic reduction of the vibrationsof the nearest-heme environment, described by the first relaxation parameter, is related to the influence of glycerol.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 04:31:42