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We study the spectra of Rydberg excitations in small, cold atom clouds in an optical dipole trap. Two sequential laser pulses with different frequencies are applied to the many-body system. The first pulse is employed to implant one Rydberg excitation excitation, while the second pulse adds another excitation. The data allow us to extract the excitation spectrum of the doubly excited state of the many-body system. Such excitation spectra reflect the characteristics of Rydberg-atom interactions present in the doubly excited states. Related results and future plans will also be discussed in the talk. |