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Spin fluctuation rates in myoglobin azide: Comparison of Mössbauer and EPR results

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Abstract

We have analyzed the Mössbauer spectra of low-spin ferric myoglobin azide, taken in small applied field from 30 K to 200 K, in terms of a dynamic lineshape model [1]. Our results show fluctuation rates having a temperature dependence which is different from that measured using EPR forT<10 K [2–4] and shed new light on the vibrational modes coupling to the spinS=1/2 of the heme iron.

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Authors and Affiliations

  1. Dept. of Physic, Knox College, 61401, Galesburg, IL, U.S.A.

    C. E. Schulz, S. Brandon & P. G. Debrunner

  2. Dept. of Physic, University of Illinois, 61801, Urbana, IL, U.S.A.

    C. E. Schulz, S. Brandon & P. G. Debrunner

Authors
  1. C. E. Schulz
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  2. S. Brandon
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  3. P. G. Debrunner
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Schulz, C.E., Brandon, S. & Debrunner, P.G. Spin fluctuation rates in myoglobin azide: Comparison of Mössbauer and EPR results. Hyperfine Interact 58, 2399–2403 (1990). https://doi.org/10.1007/BF02398351

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  • DOI: https://doi.org/10.1007/BF02398351

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