2-DIMENSIONAL ANGULAR-DISTRIBUTION OF PHOTOEMISSION SPECTRA FROM THE VALENCE-BAND OF 1T-TAS2

Two-dimensional band structures of single-crystalline 1T-TaS2 have bee n directly observed by using a new version of two-dimensional display- type spherical mirror analyzer. The intensity distribution patterns fo r linearly-polarized synchrotron radiation normally incident on the cl eaved surface have shown unusual angular distributions. The non three- fold symmetry is discussed by considering the angular dependence of th e dipole transition probability for the s-polarized synchrotron radiat ion fi om each atomic orbital with particular symmetry, as well as the tight-binding initial state and a free electron like final state. In addition, circular dichroism in angular distribution (CDAD) of the pho toemission pattern from the valence band is predicted for 1T-TaS2.