G. Szasz et A. Kovacs, Investigation of the density-functional theory-derived scaled quantum mechanical method for cage-like systems: the vibrational analysis of adamantane, MOLEC PHYS, 96(2), 1999, pp. 161-167
The Becke3-Lee-Yang-Parr(B3-LYP)/6-31G* derived scaled quantum mechanical (
SQM) method has been investigated for cage-like systems using adamantane as
the model molecule. The original scale factors were found to transfer well
to adamantane except the general heavy atom scale factor for the CC stretc
hing modes of the skeleton. For these vibrations a new individual scale fac
tor was developed in the present study. A complete vibrational analysis of
adamantane and adamantane-d(16) has been performed. The experimental vibrat
ional spectra of the compounds were reinterpreted using the scaled B3-LYP/6
-31G* harmonic force held. Some assignments of earlier less sophisticated i
nvestigations have been revised, and reliable predictions for the IR and Ra
man inactive fundamentals are proposed.