A brief description is given of the neutron diffraction facilities at the Brookhaven High Flux Beam Reactor. Present instrumentation includes two fully automated four-circle diffractometers. Cryogenic refrigerators and furnaces make possible the collection of three-dimensional intensity data from single crystals over the full temperature range 10 to 1200/sup 0/K. Recent crystallographic research at the Reactor is illustrated by three representative studies on ferrocene, H/sub 3/Ni/sub 4/(C/sub 5/H/sub 5/)/sub 4/, and pyridine-2,3-dicarboxylic acid. A survey of important areas for future work is attempted: metal hydrides and charge-density studies by combined x-ray and neutron diffraction methods are included. 6 figures, 2 tables
