binding energy, indicating that conduction electrons in BaVS3 behave as a Luttinger liquid. The powerlaw exponent is large ( & -1), indicating that electron-electron interaction is long ranged and possibly that electron-phonon interaction is also important. The spectra exhibit gradual changes with temperature. In particular, a semiconducting gap starts to open well above the metal-to-semiconductor transition temperature and fully develops below it. We propose that the gradual orthorhombic distortion of the Jahn-Teller type below -240 K lowers one of the d levels, d"~, and that below -70 K electrons are fully transferred to the d""band. The d"~b and then becomes half-filled, resulting in the opening of a Mott-Hubbard gap.
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