title: Adsorption and reaction of H2S on Cu(110) studied using scanning tunneling microscopy.
abstract: Using low-temperature scanning tunneling microscopy (STM), the adsorption and reaction of hydrogen sulfide (H2S) and its fragments (SH and S) on Cu(110) are investigated at 5 K. H2S adsorbs molecularly on the surface on top of a Cu atom. With voltage pulses of STM, it is possible to induce sequential dehydrogenation of H2S to SH and S. We found two kinds of adsorption structures of SH. The short-bridge site is the most stable site for SH, while the long-bridge site is the second. Density functional theory calculations show that the S-H axis is inclined from the surface normal for both species. The reaction of H2S with OH and O was directly observed to yield SH and S, respectively, providing a molecular-level insight into catalyst poisoning.
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. hokuyama@kuchem.kyoto-u.ac.jp.
authors.forename: Akitoshi
authors.initials: A
authors.lastname: Shiotari
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. hokuyama@kuchem.kyoto-u.ac.jp.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Okuyama
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. hokuyama@kuchem.kyoto-u.ac.jp.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Hatta
authors.affiliation: Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan. hokuyama@kuchem.kyoto-u.ac.jp.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Aruga
authors.affiliation: International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba 305-0044, Japan.
authors.forename: Ikutaro
authors.initials: I
authors.lastname: Hamada