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Collision-induced dissociation studies of Fe(m)O(n) (+) : Bond energies in small iron oxide cluster cations, Fe(m)O(n) (+) (m=1-3, n=1-6).
J Chem Phys
October 2009
Department of Chemistry, University of Utah, Salt Lake City, Utah 84112, USA.
A variety of iron oxide cluster cations is synthesized in a laser vaporization ion source. The kinetic energy dependence of the collision-induced dissociation (CID) of mass selected Fe(m)O(n) (+) (m=1-3, n=1-6) clusters with Xe is studied in this work using a guided ion beam tandem mass spectrometer. Examination of the general dissociation behavior over a broad collision energy range (0-15 eV) shows that iron oxide clusters can dissociate via evaporation of neutral Fe and O atoms as well as fission by loss of neutral O(2), FeO, FeO(2), Fe(2)O(2), and Fe(2)O(3) fragments.
View Article and Find Full Text PDFMultiply charged metal cluster anions.
Phys Rev Lett
April 2001
School of Physics, Georgia Institute of technology, Atlanta 30332-0430, USA.
Formation and stability patterns of silver dianionic and gold trianionic clusters are investigated with Penning-trap experiments and a shell-correction method including shape deformations. The theoretical predictions pertaining to the appearance sizes and electronic shell effects are in remarkable agreement with the experiments. Decay of the multiply anionic clusters occurs predominantly by electron tunneling through a Coulomb barrier rather than via fission, leading to appearance sizes unrelated to those of multiply cationic clusters.
View Article and Find Full Text PDFSolvation energy and gas-phase stability influences on alkali metal cluster ion formation in electrospray ionization mass spectrometry.
Anal Chem
March 1998
Department of Chemistry, Xavier University of Louisiana, New Orleans, Louisiana 70125.
The ability to observe abundant gas-phase metal cluster ions in electrospray ionization mass spectrometry (ESI-MS) is highly dependent on experimental conditions. Alkali halides (MX) and other alkali metal salts were used to investigate the formation of cluster ions in ESI-MS. All compounds were found to give cluster ions of the form (M(n)(+1)X(n))(+) and (M(n)X(n+1))(-), with only two alkali salts yielding doubly charged cluster ions.
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