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Two time-of-flight powder diffractometers have operated at the Intense Pulsed Neutron Source (IPNS) since August 1981. These instruments use dedicated microcomputers to focus time-of-flight events so that data from different detectors can be summed into a single histogram. Thus, large multidetector arrays can be employed at any scattering angle from 12 to 157 °. This design permits data to be collected over a uniquely wide range of d spacings while maintaining high resolution and count rates. The performance of the two instruments is evaluated by analyzing data from a standard A1203 sample by the Rietveld method. These instruments provide the capability for moderate-to high-resolution measurements with the duration of a typical run being a few hours.

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Rapid Communications are intended for the accelerated publication of important new results and are therefore given priority treatment both in the editorial offtce and in production AR. apid Communication in Physical Review 8 should be no longer than four printed pages and must be accompanied by an abstract Pag. e proofs are sent to authors.We report measurements to 6 kbar of the room-temperature compressibilities of C60 for both the fcc and sc phases using He, Ne, and Ar as pressure media. The effects of rare-gas intercalation on the fcc-to-sc transition and on the compressibilities are discussed and we compare our results with the widely disparate literature values reported for the fcc compressibility.

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