Infrared electron modes in light deformed clusters

Abstract

Infrared quadrupole modes (IRQM) of the valence electrons in light deformed sodium clusters are studied by means of the time-dependent local-density approximation (TDLDA). IRQM are classified by angular momentum components $\lambda \mu =$20, 21 and 22 whose $\mu$ branches are separated by cluster deformation. In light clusters with a low spectral density, IRQM are unambiguously related to specific electron-hole excitations, thus giving access to the single-electron spectrum near the Fermi surface (HOMO-LUMO region). Most of IRQM are determined by cluster deformation and so can serve as a sensitive probe of the deformation effects in the mean field. The IRQM branch $\lambda \mu =$21 is coupled with the magnetic scissors mode, which gives a chance to detect the latter. We discuss two-photon processes, Raman scattering (RS), stimulated emission pumping (SEP), and stimulated adiabatic Raman passage (STIRAP), as the relevant tools to observe IRQM. A new method to detect the IRQM population in clusters is proposed.

22 pages, 6 figures

References in corpus (7)

• Ionic and electronic structure of sodium clusters up to N=59
• Adiabatic population transfer via multiple intermediate states
• Raman scattering by electron-hole excitations in silver nanocrystals
• Orbital Magnetic Dipole Mode in Deformed Clusters: A Fully Microscopic Analysis
• Scissors modes in triaxial metal clusters
• Electric multipole plasmons in deformed sodium clusters
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Cited by in corpus (4)

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• STIRAP transport of Bose-Einstein condensate in triple-well trap
• Two-Photon Excitation of Low-Lying Electronic Quadrupole States in Atomic Clusters
• Exploration of electronic quadrupole states in atomic clusters by two-photon processes