XRD measurements of the structure factors of diamond

Sixtyseven structure factors for a spheroidal, single crystal of diamond (m ax diam = 0.052 cm, min diam = 0.040 cm) were measured by XRD with synchrot ron radiation and lambda = 0.4 Angstrom. The data were corrected for isotro pic extinction from measurements taken with lambda = 0.7 Angstrom. The whol e sphere of reflections, up-to a resolution of 0.27 Angstrom, was observed. The esd's of the structure factors were of the order of 0.006 e/atom and 0 .002 e/atom for the low (except 111) and high order reflections, respective ly. Despite of the large size of the specimen, the observed data agreed bet ter with published theoretical structure factors than previous experimental structure factors. It is the first complete XRD single crystal data-set si nce 1939.