OPTICAL RESPONSE OF SMALL CLOSED SHELL Cs-CLUSTER IONS

Christoph Ellert, Martin Schmidt, Christina Schmitt and Hellmut Haberland
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Christoph Ellert: Fakultät für Physik, Universität Freibung, H. Herderstr. 3, D-79104 Freiburg, Germany
Martin Schmidt: Fakultät für Physik, Universität Freibung, H. Herderstr. 3, D-79104 Freiburg, Germany
Christina Schmitt: Fakultät für Physik, Universität Freibung, H. Herderstr. 3, D-79104 Freiburg, Germany
Hellmut Haberland: Fakultät für Physik, Universität Freibung, H. Herderstr. 3, D-79104 Freiburg, Germany

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 515-517

Abstract: The absolute photoabsorption cross sections of${\rm Cs}_9^+$and${\rm Cs}_{21}^+$have been measured at two temperatures (evaporative ensemble, 115 K). The maximum of the observed resonance is nearly independent of the temperature and agrees within 5% with the Mie plasmon resonance as calculated from the bulk electron density of cesium. This is in contrast to the sodium case, where the plasmon is redshifted by about 20%. Forn=9and 21 the integrated oscillator strength amounts to 89%$({\rm Cs}_9^+)$and 73%$({\rm Cs}_{21}^+)$per valence electron in the energy range1.5 eV

Date: 1996
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DOI: 10.1142/S0218625X96000930

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