  Electric deflection measurements on liquid helium nanodroplets doped with
individual polar molecules demonstrate that the cold superfluid matrix enables
full orientation of the molecular dipole along the external field. This
translates into a deflection force which is increased enormously by comparison
with typical deflection experiments, and it becomes possible to measurably
deflect neutral doped droplets with masses of tens to hundreds of thousands of
Daltons. This approach permits preparation and study of continuous fluxes of
fully oriented polar molecules and is broadly and generally applicable,
including to complex and biological molecules. It is shown that the dipole
moments of internally cryogenically cold molecules can be directly determined
from a deflection measurement on the doped nanodroplet beam.
