EPR of O2 Impurity in Solid N2

Abstract

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.