CHEMICAL REACTION OF SILICON CLUSTER IONS 
WITH ETHYLENE BY USING FT-ICR MASS SPECTROMETER

Masamichi Kohno1 and Shigeo Maruyama1,2 

1. Engineering Research Institute, The University of Tokyo
2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
2. Department of Mechanical Engineering, The University of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan

Mass-selected silicon cluster ions were levitated in a Fourier transform ion
cyclotron resonance (FT-ICR) mass spectrometer and monitored during
chemisorption reaction with ethylene (C2H4). Through measurements of
"time-dependency" of this reaction process, drastic change of the reactivity
depending on the number of absorbed ethylene was observed, in addition to the
strong dependency to silicon cluster size.