Concepedia

Abstract

SHORT COMMUNICATIONSshows a peak electron density of 44.0 e.Zk -s, of which 9.6 e.A -s is due to the extrapolated portion of the f-curve, and a central curvature of 2350 e..~ -5, half of which arises from the extrapolation.Work is proceeding on the low-temperature refinement of the other two zones in the hope of obtaining final bond lengths for comparison with those derived from the threedimensional room-temperature analysis.We are indebted to Messrs H. Polak and A. Rathouse of I.B.M. (Israel) Ltd, Tel Aviv, and to the computing staff of the E1 Al Israel Airlines, Lydda, for making