Small doubly charged negative cluster ions were studied both by experimental and by theoretical means. In the experiments these dianions (with were produced by sputtering of a graphite specimen with a 14.5 keV ion beam at an elevated oxygen partial pressure in the vicinity of the sample’s surface. The dianions and the corresponding singly charged ions as well as homonuclear carbon dianions were detected in a double-focusing mass spectrometer. The yields of the doubly and singly charged mixed oxygen-carbon ions increase with the ratio of the arrival rate to the flux density. The abundance distribution of exhibits distinct even–odd alternations with the number of C atoms in the molecule. The flight time through the mass spectrometer of establishes a lower limit with respect to the intrinsic lifetimes of the doubly charged ions. The theoretical studies investigated dianions with the geometries of these species were optimized and the electronic stability was examined by the calculation of the electron detachment energies. In agreement with the low yield observed experimentally, is found to be weakly stable, whereas and are electronically stable gas-phase ions. In particular the latter is characterized by a large number of stable isomers.
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15 October 2002
Research Article|
October 15 2002
Discovery of a new class of stable gas-phase dianions: Mixed oxygen–carbon cluster
Hubert Gnaser;
Hubert Gnaser
Fachbereich Physik, Universität Kaiserslautern, D-67663 Kaiserslautern, Germany
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Andreas Dreuw;
Andreas Dreuw
Department of Chemistry, University of California, Berkeley, California 94720
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Lorenz S. Cederbaum
Lorenz S. Cederbaum
Physikalisch-Chemisches Institut, Ruprecht-Karls Universität, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
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J. Chem. Phys. 117, 7002–7009 (2002)
Article history
Received:
June 11 2002
Accepted:
July 24 2002
Citation
Hubert Gnaser, Andreas Dreuw, Lorenz S. Cederbaum; Discovery of a new class of stable gas-phase dianions: Mixed oxygen–carbon cluster . J. Chem. Phys. 15 October 2002; 117 (15): 7002–7009. https://doi.org/10.1063/1.1506908
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