Few-photon single ionization of cold rubidium in the over-the-barrier regime

Huanyu Ma, Xincheng Wang, Linxuan Zhang +9

Photoionization of the rubidium (Rb) atoms cooled in a magneto-optical trap, characterized by the coexistence of the ground 5$S_{1/2}$ and the excited 5$P_{3/2}$ states, is investi…