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We have examined the Mössbauer spectra of deosymyoglobin in a 6 T magnetic field in the temperature range 4.2-195 K. Spectra were fitted by the least-squares method using a phenomenological model in which the internal magnetic hyperfine field was assumed to be related to the applied field by a temperature dependent tensor õmega. The results indicate that õmega has axial symmetry and a principal axis system aligned with that of the electric field gradient (efg). The principal component of the latter is negative and lies on the symmetry axis of õmega. Our fits indicate that of efg asymmetry parameter is eta = 0.7, with no appreciable temperature dependence. Both axial and transverse components of õmega have the expected 1/T temperature dependence for T greater than 20 K. Our experimentally determined value of eta, combined with published single crystal zero-field measurements, constrains the efg-heme relative orientation to two possibilities. In neither of these is an efg principal axis near to the heme normal.
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T Yonetani
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The journal of physical chemistry. B,
T Kent, and
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Solid state nuclear magnetic resonance,
T Kent, and
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Physical review. B, Condensed matter,
T Kent, and
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Zeitschrift fur Naturforschung. Section C, Biosciences,
T Kent, and
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T Yonetani
November 2007,
Carbohydrate research,
T Kent, and
K Spartalian, and
G Lang, and
T Yonetani
October 2006,
Solid state nuclear magnetic resonance,
T Kent, and
K Spartalian, and
G Lang, and
T Yonetani
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Magnetic resonance in chemistry : MRC,
T Kent, and
K Spartalian, and
G Lang, and
T Yonetani
January 2008,
Solid state nuclear magnetic resonance,
T Kent, and
K Spartalian, and
G Lang, and
T Yonetani
May 2010,
The journal of physical chemistry. B,
T Kent, and
K Spartalian, and
G Lang, and
T Yonetani
April 1994,
Physical review. B, Condensed matter,
