Guided ion beam studies of the reactions of Cr{sub n}{sup +} (n=1{endash}18) with CO{sub 2}: Chromium cluster oxide bond energies
- Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 (United States)
The kinetic energy dependence of the reactions of Cr{sub n}{sup +} (n=1{endash}18) with CO{sub 2} are studied in a guided ion beam mass spectrometer. The primary product ions are Cr{sub n}O{sup +}, which then decompose by sequential loss of chromium atoms as the kinetic energy is increased. Simple collision-induced dissociation to form the Cr{sub n{minus}1}{sup +} product ions is also observed. Large cluster ions, n{ge}9, form the Cr{sub n}CO{sub 2}{sup +} adduct at low kinetic energies. For many cluster sizes, the cross section for the primary reaction, Cr{sub n}{sup +}+CO{sub 2}{r_arrow}Cr{sub n}O{sup +}+CO, exhibits an interesting bimodal energy behavior that is discussed in some detail. Cr{sub n}{sup +}{endash}O bond energies are measured and found to compare well with measurements obtained from guided ion beam studies of the Cr{sub n}{sup +}+O{sub 2} systems. The trends in this thermochemistry are discussed and compared to bulk phase oxidation values. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 600975
- Journal Information:
- Journal of Chemical Physics, Vol. 108, Issue 19; Other Information: PBD: May 1998
- Country of Publication:
- United States
- Language:
- English
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