  The large interest in the properties of transition metal surfaces has been
recently fostered by inelastic helium atom scattering experiments carried out
by Hulpke and Luedecke. Sharp and giant anomalies in the surface phonon
dispersion curves along Gamma-H and Gamma-S have been detected on W(110) and
Mo(110) at a coverage of one monolayer of hydrogen. At the same critical wave
vectors a smaller second indentation is present in the experimental phonon
branches. Recently we have proposed a possible interpretation which is able to
explain this and other experiments. In this paper we discuss results of our
recent ab initio calculations of the atomic and electronic properties of the
clean and H-covered Mo(110) surface in more details. For the full monolayer
coverage the calculated Fermi-surface contours are characterized by strong
nesting features which originate the observed anomalies.
