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Mossbauer spectroscopy center shift

Ga( Zn) and Cu( Zn) Mossbauer emission spectroscopy on bulk GaP, GaAs and GaSb semiconductors point at isolated zinc metal centers at Ga sites. The observed center shift to higher positive velocities at the transition from p- to n-type samples corresponds to the recharging of zinc impurity centers... [Pg.269]

The character of the coordinated catechols has been studied by Mossbauer spectroscopy [38]. Since the value of A is a measure of the hyperfine interaction of the iron electron with Fe, it reflects the covalency of the metal-ligand bands. The value of A/gnPn for the catechol complex is -18.9 T, that is the smallest observed for a dioxygenase complex -20.8 T for the phenol complex and -20.0 T for the thiophenol complex. The lowest values are explained by a greater delocalization of unpaired spin density away from the ferric center onto the catechol, generating a radical character of the catechol. The unpaired spin density delocalization is consistent with the paramagnetic shifts of protons of the catecholate ligand observed by NMR. [Pg.34]

See other pages where Mossbauer spectroscopy center shift is mentioned: [Pg.597]    [Pg.3093]    [Pg.597]    [Pg.3092]    [Pg.4068]    [Pg.384]    [Pg.433]    [Pg.229]    [Pg.86]    [Pg.268]    [Pg.433]    [Pg.120]    [Pg.601]    [Pg.329]    [Pg.73]    [Pg.119]    [Pg.125]    [Pg.305]    [Pg.157]    [Pg.121]    [Pg.254]    [Pg.2254]    [Pg.3095]    [Pg.587]    [Pg.601]    [Pg.374]    [Pg.151]    [Pg.167]    [Pg.263]    [Pg.2253]    [Pg.121]    [Pg.217]    [Pg.256]    [Pg.4072]    [Pg.62]    [Pg.225]    [Pg.259]    [Pg.260]    [Pg.910]    [Pg.516]    [Pg.292]    [Pg.1]    [Pg.392]    [Pg.344]    [Pg.213]    [Pg.261]    [Pg.391]   
See also in sourсe #XX -- [ Pg.108 ]



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Mossbauer spectroscopy

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