Collision-induced dissociation of Fe sub n sup + ( n =2--19) with Xe: Bond energies, geometric structures, and dissociation pathways

Journal Article · Tue Sep 15 04:00:00 EDT 1992 · Journal of Chemical Physics; (United States)

DOI:https://doi.org/10.1063/1.463912· OSTI ID:7261407

Lian, L; Su, C; Armentrout, P B ^[1]

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1. Department of Chemistry, University of Utah, Salt Lake City, Utah 84112 (United States)

The kinetic energy dependence of the collision-induced dissociation (CID) of Fe{sup +}{sub {ital n}} ({ital n}=11--19) with Xe is studied by using a guided ion beam mass spectrometer. As previously reported for smaller iron cluster ions, these iron cluster ions dissociate exclusively by evaporation, the sequential loss of Fe atoms. Bond energies for the larger iron cluster ions {ital D}{sup 0}(Fe{sup +}{sub {ital n}{minus}1}--Fe), {ital n}=11--19, as well as updated values for the smaller cluster ions, {ital n}=2--10, are reported. These energies are derived after explicit consideration of the effect of secondary collisions between Fe{sup +}{sub {ital n}} and Xe, and of the lifetimes of the energized iron cluster ions. Bond energies for neutral iron clusters are derived by combining these ionic bond energies with literature ionization energies for Fe{sub {ital n}}. Except for the dimers, we find that the bond energies of ionic and neutral iron clusters are very similar and change nonmonotonically as a function of cluster size, with local maxima at {ital n}=6, 7, 13, 15, and 19; and local minima at {ital n}=8, 14, and 18. Evidence for the existence of weakly bound isomers of iron cluster ions is also observed.

• OSTI ID: 7261407
• Journal Information: Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 97:6; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
BEAMS
BINDING ENERGY
BOUND STATE
CHARGED PARTICLES
COLLISIONS
DISSOCIATION
ELEMENTS
ENERGY
ENERGY DEPENDENCE
FLUIDS
GASES
GEOMETRY
ION BEAMS
ION COLLISIONS
ION PAIRS
ION-ATOM COLLISIONS
IONS
IRON IONS
ISOMERS
KINETIC ENERGY
MASS SPECTROMETERS
MATHEMATICS
MEASURING INSTRUMENTS
NONMETALS
RARE GASES
SPECTROMETERS
XENON