Strain displacements of carbon atoms in a N-60 molecule in the Pnnm phase o
f the RbC60 fulleride are first determined by X-ray diffraction. The measur
ements show that the polymeric bond length between carbon atoms of two near
est molecules C-60 is equal to 1.69(1) Angstrom, the rotation angle of the
molecule about the polymeric direction is 47.0(3)degrees. (C) 2000 Publishe
d by Elsevier Science B.V. All rights reserved.