AGE-MOMENTUM CORRELATION EXPERIMENTS ON INDUSTRIAL GRADE DIAMOND

Age-momentum correlation (AMOC) measurements as a function of temperat ure have been carried out on a large industrial grade diamond, The mea surements were performed from room temperature up to 1120 K with the s ample being heated by a pair of incandescent lamps, The temperatures s ampled represent three separate domains for diffusion processes in dia mond, Although no clear temperature dependence was evident in the posi tion lifetime or in the Doppler broadening of the annihilation radiati on, an optically or thermally induced reversible change of the electro nic structure of certain centres in the lattice was observed, An analy sis of the data in terms of the two-state trapping model allowed the e ffect to be observed in the lifetime of the first component. in the tr apping rate and in the intensity of the trapped state, The results dem onstrate the potential of the positron to probe electronic transitions at defects in the bulk of the diamond lattice.