Use of autoionization to measure microwave-driven transitions between high-n strontium Rydberg states

The use of autoionization as a tool to measure transitions between high-n strontium Rydberg states with low-to-intermediate values of L is described and is demonstrated through observations of Rabi oscillations when driving 5snf ¹F₃ → 5s(n+ 1)g ¹G₄, 5snf ¹F₃ → 5s(n+ 2)h ¹H₅, and 5snp ¹P₁ → 5s(n+ 1)nd ¹D₂ transitions using microwave fields. The technique is shown to offer advantages when compared to selective field ionization, and can be used with other alkaline-earth and alkaline-earth-like metals.