Bl. Grigorenko et al., MANY-BODY POTENTIALS AND DYNAMICS BASED ON DIATOMICS-IN-MOLECULES - VIBRATIONAL FREQUENCY-SHIFTS IN ARNHF (N=1-12,62) CLUSTERS, The Journal of chemical physics, 104(14), 1996, pp. 5510-5516
The conjecture that limited basis diatomics-in-molecules type potentia
ls may serve as an accurate representation of many-body interactions i
s explored through molecular dynamics simulations of ArnHF (n=1-12,62)
. The important ingredient in the constructed potentials is the inclus
ion of ionic configurations of HE Once the admixture between ionic and
covalent configurations is calibrated by reference to an ab initio su
rface of the ArHF dimer, a single three-body potential energy surface
is defined, and used in subsequent simulations of larger clusters. The
vibrational frequencies of HE which are computed from velocity-veloci
ty autocorrelation functions, quantitatively reproduce the cluster siz
e dependent redshifts. (C) 1996 American Institute of Physics.