title: A study to control chemical reactions using Si:2p core ionization: site-specific fragmentation.
abstract: In an aim to create a "sharp" molecular knife, we have studied site-specific fragmentation caused by Si:2p core photoionization of bridged trihalosilyltrimethylsilyl molecules in the vapor phase. Highly site-specific bond dissociation has been found to occur around the core-ionized Si site in some of the molecules studied. The site specificity in fragmentation and the 2p binding energy difference between the two Si sites depend in similar ways on the intersite bridge and the electronegativities of the included halogen atoms. The present experimental and computational results show that for efficient "cutting" the following conditions for the two atomic sites to be separated by the knife should be satisfied. First, the sites should be located far from each other and connected by a chain of saturated bonds so that intersite electron migration can be reduced. Second, the chemical environments of the atomic sites should be as different as possible.
authors.affiliation: Department of Chemistry, Faculty of Science and Graduate School of Science and Engineering, Ehime University, Matsuyama 790-8577, Japan. nagaoka@ehime-u.ac.jp
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Nagaoka
authors.forename: Hironobu
authors.initials: H
authors.lastname: Fukuzawa
authors.forename: Georg
authors.initials: G
authors.lastname: Prümper
authors.forename: Mai
authors.initials: M
authors.lastname: Takemoto
authors.forename: Osamu
authors.initials: O
authors.lastname: Takahashi
authors.forename: Katsuhiro
authors.initials: K
authors.lastname: Yamaguchi
authors.forename: Takuhiro
authors.initials: T
authors.lastname: Kakiuchi
authors.forename: Kiyohiko
authors.initials: K
authors.lastname: Tabayashi
authors.forename: Isao H
authors.initials: IH
authors.lastname: Suzuki
authors.forename: James R
authors.initials: JR
authors.lastname: Harries
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Tamenori
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Ueda