Two-photon Rydberg resonances in lithium-7 obtained by recording reduction of resonance fluorescence

摘要

In a magneto-optical trap (MOT) of Li-7, two-photon Rydberg resonances are recorded by using a spectroscopic technique, which based on variation in the resonance fluorescence. The first excitation frequency is detuned by 0.59 GHz from the intermediate 2P (3/2) state. Two counter-propagating laser beams are used. The resonances are studied on two-photon transitions 2S (1/2) - nl in a range of principal quantum number n from 38 to 120. The widths of the observed resonances are varied from 4.4 to 13 MHz for different MOT parameters.