= 0.0560(5) Å. The slightly more complicated molecule P3As has two different distances P-P and P-As. Because their contributions overlap in the RDC, the peak is broader (also seen in a more rapid damping in the molecular scattering). The determination of these two independent parameters is more difficult and results in less precise parameter values than for P4. Some selected other examples of important contributions to the structural chemistry of molecules are provided here: Structure of diborane B2H6 Structure of the planar trisilylamine Determinations of the structures of gaseous elemental phosphorus P4 and of the binary P3As Determination of the structure of C60 and C70 Structure of tetranitromethane Absence of local C3 symmetry in the simplest phosphonium ylide H2C=PMe3 and in amino-phosphanes like P(NMe2)3 and ylides H2C=P(NMe2)3 Determination of intramolecular London dispersion interaction effects on gas-phase and solid-state structures of diamondoid dimers Links http://molwiki.org/wiki/Main_Page—A free encyclopaedia, mainly focused on molecular structure and dynamics. The story of gas-phase electron diffraction (GED) in Norway References Diffraction