An analysis of the electron spin resonance spectra of Xhyphen;irradiated single crystals of MgHPO3middot;6H2O has shown that the principal longhyphen;lived paramagnetic species produced by irradiation is a PO3fragment. This fragment retains the same orientation within the unit cell as the undamaged molecule. The parallel and perpendicular components of the diagonal (electronhyphen;spin) mdash; (nuclearhyphen;spin) coupling dyadic for the phosphorus nucleus are found to be of the same sign and of magnitude 2210 and 1730 Mc, respectively. These results are compared with theoretical values of the distributed dipole and contact hyperfine interactions calculated on the assumption that the unpaired electron is located in ansp3hybrid orbital centered on phosphorus.
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