BULK CONTRIBUTIONS TO THE PHOTOEMISSION SPECTRA OF CHEMISORBED HYDROGEN ON THE SI(111)-(7X7) SURFACE - A THEORETICAL-STUDY

From a recent theoretical study(1) using crystalline extension of the Huckel method, the surface contributions to the main features P-1 and P-2 observed in photoemission experiments when atomic hydrogen is chem isorbed on the Si(111)-(7 x 7) reconstructed surface have been attribu ted to the saturation of the dangling bonds of the adatoms. This paper investigates the bulk contributions to those peaks. The contributions are derived from calculations on an eight-layer slab and on a real bu lk. We conclude that states corresponding to a bonding between success ive silicon layers contribute to peak P-2.