The anisotropic EPR spectrum was measured in single crystals of human nitrosylhemoglobin. The principal values and axis directions of the g factor and of the N hyperfine interaction of the NO ligand were determined for an alpha and a beta subunit. A model for the geometry, orientation and orbital spin distribution at NO bound to the Fe atom in the subunits is derived from the measured g values and hyperfine interaction. The relationship between the NO bond, the Fe crystal field and the g and A principal axis directions are discussed.

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The thermal radiation emitted by small particles heated by a modulated electron beam can be analyzed to give a quantitative measure of the thermal coupling between the particle and the substrate on which it rests.

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