Structure of the Si(011)-(16x2) surface and hydrogen desorption kinetics investigated using temperature-programmed desorption

D-2 temperature-programmed desorption (TPD) was used to probe the structure of the Si(011)-(16 x 2) surface. Deuterium was adsorbed at 200 degrees C to coverages theta(D) ranging up to complete saturation (approximately 1.1 ML) and the sample heated at 5 degrees C s(-1). TPD spectra exhibited three second-order desorption peaks labelled beta(2), beta(1)* and beta(1) centered at 430, 520 and 550 degrees C. Of the proposed models for the Si(011)-(16 x 2) reconstruction, the present TPD results as a function of theta(D) provide support for the adatom/dimer model with the beta(2) peak assigned to D-2 desorption from the dihydride phase, while the beta(1)* and beta(1) peaks arise from adatom and surface-atom monohydride phases. (C) 1997 Elsevier Science B.V.