Mechanism of wedge effect in splitting of chemical bond by impact of X2 -(C02)n onto silicon surface (X=Br, I)

Uwe Kalmbach, Hisato Yasumatsu, Shin'ichi Koizumi, Akira Terasaki, Tamotsu Kondow

研究成果: Contribution to journalArticle査読

12 被引用数 (Scopus)


Dissociation of Br2 - (into Br and Br-) in a cluster anion, Br2 -(CO2)n, by impact of Br2 - (CO2)n on a silicon surface was investigated as a function of the number of CO2 molecules, n, at a collision energy per Br2 - of 30-50 eV. The branching fraction of the Br2 - dissociation used as a propensity of the Br2 - dissociation rate showed a marked n-dependence similar to that observed in the collisional dissociation of 12 -(CO2)n, on a silicon surface. The result is explained in terms of wedge effect in which a CO2 molecule at a midpoint of Br2 - splits the Br2 - bond as a wedge vs. cage effect in which the bond splitting of Br2 - in the CO2 solvent cage is suppressed. The agreement of the n-dependence between the Br2 -(CO2)n and I2 -(CO2)n collisions lends a further support for the validity of the bond splitting by the wedge action. A molecular dynamics simulation reproduces the wedge effect in the Br2 -(CO2)n collision, as well. The cage effect appearing in the vicinity of n=12 corresponds to the complettion of the first CO2 solvent shell as is the case of the I2 -(CO2)n collision.

ジャーナルJournal of Chemical Physics
出版ステータス出版済み - 4 15 1999

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)
  • 物理化学および理論化学


「Mechanism of wedge effect in splitting of chemical bond by impact of X<sub>2</sub> <sup>-</sup>(C0<sub>2</sub>)<sub>n</sub> onto silicon surface (X=Br, I)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。