Two-photon processes like Raman scattering (RS), stimulated emission pumping (SEP) and stimulated adiabatic Raman passage (STIRAP) are widely used for investigation of non-dipole modes in atoms and molecules. However, some clusters properties (broad level structures, short lifetimes, non-radiative decay channels, ...) make questionable their implementation to atomic clusters. Our TDLDA analysis shows that these two-photon techniques can nevertheless be applied to clusters and deliver valuable information on cluster features. As an instructive case, we consider infrared quadrupole electron modes (IRQM) in light deformed clusters. IRQM provide a direct access to the single electron spectra and can serve as a sensitive tool for investigation of many cluster properties. Being induced by cluster deformation, IRQM deliver important information on deformation effects in cluster mean field.
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