title: Atomistic view of the recombinative desorption of H2 from H/Si(100).
abstract: Scanning tunneling microscopy is employed to investigate the recombinative desorption of H2 from hydrogenated Si(100) surfaces consisting of dihydride (SiH2) and monohydride (SiH) surface species organized in (1 x 1), (3 x 1), and (2 x 1) configurations. The results show that desorption from dihydrides involves a pair of neighboring dihydrides linked along the tetrahedral bond direction. Dihydrides in (3 x 1) domains are separated in the same direction by monohydrides, and desorption from a pair is geometrically impossible. The same desorption mechanism nevertheless applies via first a position switching of dihydrides with neighboring monohydrides.
authors.affiliation: Institute of Physics, National Chiao-Tung University, Hsinchu, Taiwan.
authors.forename: S-S
authors.initials: SS
authors.lastname: Ferng
authors.forename: C-T
authors.initials: CT
authors.lastname: Lin
authors.forename: K-M
authors.initials: KM
authors.lastname: Yang
authors.forename: D-S
authors.initials: DS
authors.lastname: Lin
authors.forename: T-C
authors.initials: TC
authors.lastname: Chiang