Molecular beam electric deflection of the tetrahalides CF
4,
CCl4,SiF
4,
SiCl4,
GeCl4,TiF
4,
TiCl
Nanometer range correlations between molecular orientations in liquids of molecules with perfect tetrahedral shape: CCl/sub 4/, SiCl/sub 4/, GeCl/sub 4/, and SnCl/sub 4/