NONADDITIVE INTERACTIONS IN THE H-2 TRIMER

Explicit equations for the second order nonadditive induction energy f or interactions involving three linear molecules have been derived usi ng the MAPLE Symbolic computational language. This nonadditive inducti on energy (involving the permanent quadrupole moments and dipole polar izabilities) is compared with the triple-dipole dispersion energy for a system consisting of three hydrogen molecules, in two different conf igurations. It is round that for most of the orientations studied the nonadditive induction energy is comparable in magnitude or larger than the triple-dipole dispersion energy. (C) 1996 American Institute of P hysics.