  We present a combined experimental and theoretical study of the electronic
structure of the intermetallic compound TiGePt by means of photoelectron
spectroscopy, x-ray absorption spectroscopy and fullpotential band structure
calculations. It was recently shown that TiGePt undergoes a structural phase
transition by heating which is accompanied by a large volume contraction and a
drastic change of physical properties, in particular a large decrease of the
electrical resistivity. The present study revealed substantial differences in
the electronic structure for the two TiGePt modifications, although they have
the same nominal composition and show similar electron counts for particular
valence band states. Our photoemission experiments and band structure
calculations establish that an insulator-to-metal transition occurs with an
appreciable band broadening and closing of the band gap
