β-NMR study of boron in diamond

A β-NMR study of 12B implanted in diamond was performed in order to investigate the implantation sites and the defects. The maintained polarization of 12B was measured by use of widely modulated rf around the Larmor frequency (ν = νL ± 200 kHz) as a function of temperature from 160 K to 320 K. The observed polarization was found to be almost constant at about 0.9 % in this temperature range. The initial polarization for this system was obtained as about 8.1 %. Therefore about 10 % of the implanted 12B maintained its polarization in this frequency range. Conversely, about 90 % of the implanted 12B was undetected in the present experiment.