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We demonstrate a method for probing interaction effects in a thermal beam ofstrontium atoms using simultaneous measurements of Rydberg EIT andspontaneously created ions or electrons. We present a Doppler-averaged opticalBloch equation model that reproduces the optical signals and allows us toconnect the optical coherences and the populations. We use this to determinethat the spontaneous ionization process in our system occurs due to collisionsbetween Rydberg and ground state atoms in the EIT regime. We measure the crosssection of this process to be 0.6 $\pm$ 0.2 $\sigma_{\rm{geo}}$, where$\sigma_{\rm{geo}}$ is the geometrical cross section of the Rydberg atom. Thisresults adds complementary insight to a range of recent studies of interactingthermal Rydberg ensembles.

Probing interactions of thermal Sr Rydberg atoms using simultaneous optical and ion detection