  The correlation between electronic and crystal structures of 1T-TiSe2 in the
charge density wave (CDW) state is studied by x-ray diffraction. Three families
of reflections are used to probe atomic displacements and the orbital asymmetry
in Se. Two distinct onset temperatures are found, TCDW and a lower T*
indicative for an onset of Se out-of-plane atomic displacements. T* coincides
with a DC resistivity maximum and the onset of the proposed gyrotropic
electronic structure. However, no indication for chirality is found. The
relation between the atomic displacements and the transport properties is
discussed in terms of Ti 3d and Se 4p states that only weakly couple to the CDW
order.
