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Phys. Rev. Lett. 85, 3141 - 3144 (2000)

Twist Mode in Spherical Alkali Metal Clusters

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V. O. Nesterenko1,2, J. R. Marinelli1, F. F. de Souza Cruz1, W. Kleinig2,3, and P.-G. Reinhard4
1Departamento de Fisica, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil
2Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Moscow region, 141980, Russia
3Technische Universität Dresden, Institut für Analysis, D-01062 Dresden, Germany
4Institut für Theoretische Physik, Universität Erlangen, D-91058 Erlangen, Germany

Received 17 April 2000

A remarkable orbital quadrupole magnetic resonance, so-called twist mode, is predicted in alkali metal clusters where it is represented by Iπ  =  2- low-energy excitations of valence electrons with strong M2 transitions to the ground state. We treat the twist by both macroscopic and microscopic ways. In the latter case, the shell structure of clusters is fully exploited, which is crucial for the considered size region ( 8≤Ne≤1314). The energy-weighted sum rule is derived for the pseudo-Hamiltonian. In medium and heavy spherical clusters, the twist dominates over its spin-dipole counterpart and becomes the most strong multipole magnetic mode.


©2000 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.85.3141
DOI: 10.1103/PhysRevLett.85.3141
PACS: 36.40.Cg, 36.40.Gk, 36.40.Vz, 36.40.Wa

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