Valence-band structure of α-MoTe2 by angular-resolved photoelectron spectroscopy in the constant-final-state mode

In this work a complete valence-band structure of alpha-MoTe2 using angular-resolved photoelectron spectroscopy (ARPES) with synchrotron radiation is presented. The dispersion along the perpendicular component (k) over right arrow(perpendicular to) of the wave vector is found to be non-negligible for a number of states, especially at higher binding energies. The effect of this (k) over right arrow(perpendicular to) dispersion on the determination of the exact dispersion of the individual states along (k) over right arrow(parallel to) is discussed. By performing ARPES in the constant-final-state mode for off-normal emission spectra, at least the (k) over right arrow(parallel to) component can be determined unequivocally. Comparison of theoretical calculations with the resulting experimental valence-band structure shows partial agreement. [S0163-1829(99)01131-5].