Quantum effects on liquid dynamics as evidenced by the presence of well-defined collective excitations in liquid para-hydrogen
The origin of the well-defined collective excitations found in liquid para-H2 by recent experiments is investigated. The persistence of their relatively long lifetimes down to microscopic scales is well accounted for by calculations carried out by means of path-integral-centroid molecular dynamics. In contrast only overdamped excitations are found in calculations carried within the classical limit. The results provide fully quantitative evidence of quantum effects on the dynamics of a simple liquid.
Bermejo
FJ
Consejo Superior de Investigaciones Cientificas, Serrano 121-123, E-28006 Madrid, Spain.
Kinugawa
K
Cabrillo
C
Bennington
SM
Fak
B
Fernandez-Diaz
MT
Verkerk
P
Dawidowski
J
Fernandez-Perea
R