Collision-induced dissociation of Fe+n (n=2–10) with Xe: Ionic and neutral iron binding energies

Journal of Chemical Physics - Tập 90 Số 10 - Trang 5466-5485 - 1989
S. K. Loh1, David Hales1, Lian Li1, P. B. Armentrout1
1Department of Chemistry, University of California, Berkeley, California 94720

Tóm tắt

Cross sections for collision-induced dissociation (CID) of Fe+n with Xe, 2≤n≤10, are presented. Experiments were performed on a newly constructed guided ion beam mass spectrometer, the design and capabilities of which are described in detail. The single mechanism for dissociation of iron cluster ions is sequential loss of iron atoms with increasing collision energies. There is no evidence for fission to molecular neutral products. The cross section threshold energy dependences are analyzed to give the bond dissociation energies (BDEs), D0(Fe+n−1–Fe). Data analysis employs an empirical model that incorporates RRKM theory to account for inefficient dissociation on the time scale of the experiment. Results show that Fe+6 has the strongest BDE, D0(Fe+5–Fe) =3.44±0.18 eV, while Fe+3 is the most weakly bound, D0(Fe+2–Fe) =1.64±0.15 eV. Neutral cluster BDEs are derived from ionic binding energies and known ionization potentials. Branching ratios and other cross section features are also discussed with respect to cluster size.

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Thông tin xuất bản

Journal of Chemical Physics

Tập 90 Số 10

5466-5485

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