The interplay between the surface band structure and possible surface reconstructions of Mo(112)

Abstract

The interplay between the surface band structure and possible surface reconstructions of Mo (112)" (2000). Peter Dowben Publications. 118.

Interplay between plasmons and the band structure for the Mo(112) surface

“…22,42 The photoemission ͑ARPES͒ experiments, with a resolution between 0.10 and 0.25 eV, were carried out at the Synchrotron Radiation Center in Stoughton, Wisconsin in an ultrahigh vacuum ͑UHV͒ chamber employing a hemispherical electron energy analyzer with an angular acceptance of Ϯ1°, which has also been described elsewhere. 43 The photoelectrons were collected with emission angles defined with respect to the surface normal.…”

“…22 The surface of the Mo͑112͒ crystal was cleaned by repeated annealing in oxygen and electron bombardment ͑flashing͒ and the crystal temperature was monitored with a W-5% Re W-26% Re thermocouple with an accuracy of Ϯ5 K. Exposure of the Mo͑112͒ crystal to oxygen was controlled with the use of a standard UHV leak valve.…”

“…Identification of the bands, however, is complicated by surface and adsorbate umklapp processes [19][20][21] and surface reconstructions, in particular, well known to occur with molybdenum surfaces. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] The surface photoeffect can further complicate the identification of the bulk bands by the normal photoemission technique by making both height and position of the spectral peaks dependent upon photon energy. These complications might result in an ambiguous interpretation of experimental data in absence of calculated band structure along the relevant directions in the bulk Brillouin zone.…”

“…We will show that with Mo͑112͒, almost all the photoemission features combine contributions from both the surface and the bulk. To illustrate this suggestion, here we undertake an analysis of the angle-resolved photoemission ͑ARPES͒ and inverse photoemission ͑IPES͒ studies of the band structure, which have been partly published elsewhere, 22 and model linear augmented plane wave ͑LAPW͒ film calculations of the electronic structure for a free monolayer and for a three-layer slab simulating the Mo͑112͒ surface. Calculations of the bulk band structure along the normal to the surface is also presented and compared with band dispersion found from the wave vector dependence (k Ќ -dependent͒ photoemission spectra along the surface normal.…”

Enhanced electron-phonon coupling at the Au/Mo(112) surface

“…The surface of the Mo(112) sample was cleaned by the standard method of repeated annealing (at ~1400°C) in oxygen atmosphere with the oxygen partial pressure of ~1×10 -6 torr, followed by cycles of annealing at 1000-1300°C and flashing at ~1800°C, similar to the procedures used elsewhere [22,[25][26][27][28][29]. Low energy electron diffraction (LEED) and Auger electron spectroscopy (AES) were used to verify the quality of the Mo(112) surface.…”