Low-energy quadrupole modes in deformed clusters
V. O. Nesterenko, W. Kleinig, P. -G. Reinhard, D. S. Dolci
Abstract
Properties of low-energy (infra-red) quadrupole modes (LEQM) of multipolarity +AFw-lambda+AFw-mu =20, 21 and 22 in deformed sodium clusters are studied within the Kohn-Sham LDA RPA approach. Possible manifestations of LEQM in stimulated Raman adiabatic passage (STIRAP) reaction are discussed. It is shown that, in free light clusters, where the low-energy spectrum is delute, LEQM can be unambiguously identified as particular electron-hole pairs. This gives a chance to reconstruct the mean field level scheme near the Fermi surface. Moreover, due to the connection with electric +AFw-lambda+AFw-mu =21 mode, the scissors mode can be detected. In heavy (supported) oblate clusters, LEQM are in general rather involved. Nevertheless, some interesting +AFw-lambda+AFw-mu =21 and 22 structures determined by specific deformation effects can be resolved. The origin of the structures is discussed in detail.
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