Metastable dissociation of doubly charged CO/sub 2/ cluster ions
Multiply charged CO/sub 2/ cluster ions are produced by adiabatic nozzle expansion and subsequent ionization by electron impact. They are analyzed in a double focussing sector field mass spectrometer (reversed geometry). (CO/sub 2/)/sub n//sup 2 +/ cluster ions are only detected above an electron energy of about 30 eV and with sizes n greater than or equal to 45 in the direct mass spectrum. Metastable decay reactions of these ions occurring in the first field free region are investigated by decoupling the analyzer fields. It is shown that (CO/sub 2/)/sub n//sub 2//sup +/ with sizes of n greater than or equal to 44 lose one neutral monomer or, roughly ten times less probable, two neutral monomers in these dissociation reactions. The total effective dissociation rates for these dissociation processes are very large, e.g. approx.2 x 10/sup 4/ s/sup -1/ for (CO/sub 2/)/sub 47//sup 2 +/. Conversely, no singly charged fragment ions were observed to be produced by Coulomb explosion from doubly charged clusters in the first field free region. Moreover, besides doubly charged stoichiometric ions the existence of doubly charged fragment cluster ions with n greater than or equal to 44 in observed in the mass spectra.
- Research Organization:
- Leopold Franzens Universitaet, Innsbruck, Austria
- OSTI ID:
- 6631726
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON DIOXIDE
DISSOCIATION
IONIZATION
CATIONS
ELECTRON BEAMS
EXPERIMENTAL DATA
ION PAIRS
MASS SPECTRA
MASS SPECTROSCOPY
REACTION KINETICS
BEAMS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHARGED PARTICLES
DATA
INFORMATION
IONS
KINETICS
LEPTON BEAMS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE BEAMS
SPECTRA
SPECTROSCOPY
400201* - Chemical & Physicochemical Properties