  Recently, Tao and Mo (TM) derived a meta-generalized gradient approximation
functional based on a model exchange-correlation hole. In this work, the
performance of this functional is assessed on standard test sets, using the
6-311++G(3df,3pd) basis set. These test sets include 223 G3/99 enthalpies of
formation, 99 atomization energies, 76 barrier heights, 58 electron affinities,
8 proton affinities, 96 bond lengths, 82 harmonic vibrational frequencies, 10
hydrogen-bonded molecular complexes, and 22 atomic excitation energies. Our
calculations show that the TM functional can achieve high accuracy for most
properties considered, relative to the LSDA, PBE, and TPSS functionals. In
particular, it yields the best accuracy for proton affinities, harmonic
vibrational frequencies, hydrogen-bonded dissociation energies and bond
lengths, and atomic excitation energies.
