Abstract
WE have published1 a detailed account of the variation of electron resonance line width in both acid met myoglobin and met myoglobin azide as a function of orientation. We explained the results in terms of a random misorientation of the molecular axes within the single crystals, and showed that, because of the large g value anisotropy in the acid met derivative, a standard deviation of only 1.6° in angular distribution is sufficient to explain the results obtained. These measurements were carried out at Q-band frequencies and the slight deviations from the expected variations were adequately explained in terms of residual broadening mechanisms such as spin–spin interaction and unresolved hyperfine structure. It can be shown1 that the misorientation produces a linewidth in an axially symmetric system given by 
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References
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SLADE, E., INGRAM, D. Electron Spin Resonance Linewidths in Met Myoglobin. Nature 220, 785 (1968). https://doi.org/10.1038/220785a0
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DOI: https://doi.org/10.1038/220785a0
