PHOTOEMISSION-STUDY OF THE SURFACE ELECTRONIC-STRUCTURE OF MO(001) AND MO(001)-2H

We report a high-resolution angle-resolved photoemission study of the surface electronic structure of the room-temperature phase of Mo(001) and Mo(001)-2H. We have focused particularly upon the electron states on the clean surface within a few electron volts of the Fermi level in an attempt to characterize the interplay between the electronic and atomic structures of this surface. We relate these measurements of the surface band structure along the high-symmetry directions to recently published surface Fermi contours. Most importantly, we observe a band to be located at or near the Fermi level over a small region of momentum space, near the middle of the SIGMA-line. This feature is well placed to couple to phonon modes characteristic of the low-temperature reconstruction observed on this surface. The relationship of these results to existing calculations, to our previous results for W(001), to the wave vector of the reconstruction, and to recent measurements of surface phonon dispersion relations will be discussed.