## Abstract

We have examined chemical reactions of small silicon cluster ions Si _{n}^{+} for n = 7-16 with polar organic molecules M (M = CH_{3}CN, CD_{3}OD, C_{2}H_{5}CN, and C _{2}H_{5}OH). The intensities of the adsorption products Si _{n}M_{m}^{+} for m = 1 and 2 were investigated as a function of n. We found for all polar molecules that the relative intensity of Si_{n}M^{+} to the unreacted Si_{n}^{+} is smaller for n = 11, 13, and 14, that is, the adsorption reactivity is smaller for these n than others. It was also commonly observed that the SigM _{2}^{+} ion are more intense than neighboring n. We discussed the relationship of the reactivity with the geometrical structures and the stabilities of the bare Si_{n}^{+} ions and adsorbed Si _{n}(CH_{3}CN)_{m}^{+} ions, from theoretical calculations based on density functional theory.

Original language | English |
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Pages (from-to) | 2502-2507 |

Number of pages | 6 |

Journal | International Journal of Modern Physics B |

Volume | 19 |

Issue number | 15-17 |

DOIs | |

Publication status | Published - 2005 Jul 10 |

## Keywords

- Adsorption reaction
- Cluster ion
- Silicon

## ASJC Scopus subject areas

- Statistical and Nonlinear Physics
- Condensed Matter Physics