  We have studied the electronic structure of the spin-1/2 quantum magnet TiOCl
by polarization-dependent momentum-resolved photoelectron spectroscopy. From
that, we confirm the quasi-one-dimensional nature of the electronic structure
along the crystallographic b-axis and find no evidence for sizable
phonon-induced orbital fluctuations as origin for the non-canonical
phenomenology of the spin-Peierls transition in this compound. A comparison of
the experimental data to our own LDA+U and Hubbard model calculations reveals a
striking lack of understanding regarding the quasi-one-dimensional electron
dispersions in the normal state of this compound.
