  The standard Frohlich model of the interaction of band states with phonons is
applied to the case of deuterons solved in metals. A simple variational
solution of this model predicts at least one highly coherent state of the
deuteron-phonon system having a total energy significantly lower than that of
uncorrelated interstitial deuterons and only thermal phonons, and that this
phase may actually be exhibited at room temperature and high levels of
deuteration.
