Local nuclear orientation of125I in tin and graphite using defect induced electric field gradients

Defect-induced field electric field gradients, generated by ion implantation of¹²⁵I in α- and β-Sn and in graphite, were used to obtain local nuclear orientation at low temperatures. The resulting nuclear orientation at the parent¹²⁵I state was detected by¹²⁵Te Mössbaner spectroscopy. From the measured nuclear quadrupole interaction strengths at the parent state, the electric field gradient and the cooling behavior of implanted atoms were studied.