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Proceedings Paper

H2 adsorption on C60 aggregates doped with cesium
Author(s): M. Renzler; M. Harnisch; M. Schwärzler; M. Daxner; P. Scheier; O. Echt
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Paper Abstract

We explore the formation of C60-cesium and C60-cesium-hydrogen complexes in superfluid helium nanodroplets. Anomalies in mass spectra of these doped droplets reveal anomalies in the stability of ions. (C60)mCsn + complexes, m ≤ 5, are particularly stable if they contain n = 6m + 1 cesium atoms. Apparently, each C60 can ionically bind up to six cesium atoms because the lowest unoccupied orbital of neutral C60 is three-fold degenerate. The additional cesium cation accounts for the charge of the singly charged complex. Another cesium ion accounts for the charge of (C60)mCsn 2+ dications. However, for m = 4 the abundance distribution of dications is completely different. Instead of an anomaly at n = 6m + 2 = 26 one observes a strong odd-even alternation over a wide range of nvalues, possibly indicating the onset of metallic behavior. Concerning hydrogen adsorption on C60Cs we conclude that H11C60Cs+ is strongly bound, in close agreement with theoretical studies that predict high stability for H12C60A, A = lithium or sodium. Furthermore, this number (x = 11) accounts for the number of hydrogen atoms in a solvation shell around C60Cs+ which contains more hydrogen than the solvation shell around bare C60 +.

Paper Details

Date Published:
Proc. SPIE 10174, International Symposium on Clusters and Nanomaterials, ; doi: 10.1117/12.2230634
Show Author Affiliations
M. Renzler, Univ. of Innsbruck (Austria)
M. Harnisch, Univ. of Innsbruck (Austria)
M. Schwärzler, Univ. of Innsbruck (Austria)
M. Daxner, Univ. of Innsbruck (Austria)
P. Scheier, Univ. of Innsbruck (Austria)
O. Echt, Univ. of Innsbruck (Austria)
The Univ. of New Hampshire (United States)

Published in SPIE Proceedings Vol. 10174:
International Symposium on Clusters and Nanomaterials
Puru Jena; Anil K. Kandalam, Editor(s)

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