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The EPR spectrum of O2 impurity in solid N2 has been observed at K band and at X band. The results are consistent with the specific-heat results for this system and indicate that the Σ3 state is split in zero field by 105 ± 15 GHz. A small temperature-dependent splitting of the upper doublet is indicated by the results, and the possibility of using O2 as a probe to investigate the motions of molecular solids is pointed out.
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Graham et al. (1970) studied this question.
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