EPR of O2Impurity in Solid N2, CO, Ar, and CD4Prepared from the Vapor

摘要

The EPR spectra of O2impurity in specimens of N2, CO, Ar, and CD4condensed from the gas at 4.2deg;K have been studied at Xhyphen; and Khyphen;band frequencies. For the N2host, studies have been made of the effect of varying concentration and temperature. The polycrystalline absorption profiles for N2and CO show structure and are analyzed. Those for Ar and CD4show only broad structureless absorption. The results show that in N2and CO the O2molecules occupy isolated and essentially axial symmetry sites at low concentrations but that new features, attributed to different sites arising from clustering or defects, appear at higher concentrations. The extraction of useful information is limited by the polycrystalline nature of the samples.