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We establish low-temperature resonant inelastic light scattering (RILS)spectroscopy as a tool to probe the formation of a series of moir\'e-bands intwisted WSe2 bilayers by accessing collective inter-moir\'e-band excitations(IMBE). We observe resonances in such RILS spectra at energies in agreementwith inter-moir\'e band (IMB) transitions obtained from an ab-initio basedcontinuum model. Transitions between the first and second IMB for a twist angleof about 8{\deg} are reported and between first and second, third and higherbands for a twist of about 3{\deg}. The signatures from IMBE for the latterhighlight a strong departure from parabolic bands with flat minibandsexhibiting very high density of states in accord with theory. Theseobservations allow to quantify the transition energies at the K-point where thestates relevant for correlation physics are hosted.

Collective charge excitations between moir\'e-minibands in twisted WSe2 bilayers from resonant inelastic light scattering