JMSSJ On-line, Vol. 52 (2004) No. 1, pp. 51-54
Gas-phase Stability of Cluster Ions OCS+(OCS)n
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    Koki HIIZUMI, Fumiyuki NAKAGAWA, Kazuo FUJITA, Masayumi ISHIDA, Keiichiro AKIYAMA, Kenzo HIRAOKA, and Shinichi YAMABE

    a)Graduate School of Engineering, University of Yamanashi (4-3-11 Takeda, Kofu 400-8511, Japan),b)Faculty of Engineering, University of Yamanashi (4-3-11 Takeda, Kofu 400-8511, Japan)*c)Clean Energy Research Center, University of Yamanashi (4-3-11 Takeda, Kofu 400-8511, Japan),d)Department of Chemistry, Nara University of Education (Takabatake-cho, Nara 630-8528, Japan)
The gas-phase clustering reaction, OCS+(OCS)n-1 + OCS = OCS+(OCS)n, was investigated using a pulsed-electron beam high-pressure mass spectrometer. The bond energies of OCS+(OCS) and OCS+(OCS)2 were determined to be 23.9 and 7.8 kcal/mol, respectively. The sudden drop of the bond energies OCS+(OCS)→OCS+(OCS)2 indicates the covalent bond formation in the dimer cation (OCS)2+ and the interaction in the trimer cluster ion (OCS)2+··· OCS is mainly electrostatic.
Key words: Carbonyl sulfide, Cluster ion, High pressure mass spectrometry
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