  Glasses produced via physical vapor deposition can display greater kinetic
stability and lower enthalpy than glasses prepared by liquid cooling. While the
reduced enthalpy has often been used as a measure of the stability, it is not
obvious whether dynamic measures of stability provide the same view. Here, we
study dynamics in vapor-deposited and liquid-cooled glass films using molecular
simulations of a bead-spring polymer model as well as a Lennard-Jones binary
mixture in two and three dimensions. We confirm that the dynamics in
vapor-deposited glasses is indeed slower than in ordinary glasses. We further
show that the inherent structure energy is a good reporter of local dynamics,
and that aged systems and glasses prepared by cooling at progressively slower
rates exhibit the same behavior as vapor-deposited materials when they both
have the same inherent structure energy. These findings suggest that the
stability inferred from measurements of the energy is also manifested in
dynamic observables, and they strengthen the view that vapor deposition
processes provide an effective strategy for creation of stable glasses.
