Laser spectroscopy of the thallium atom based on transitions 6p 1/2 → 6D 3/2 → nF 5/2 (n = 13–24)

Isotope-selective laser excitation and field ionization of thenF5/2Rydberg states in a thallium beam

“…This paper is devoted to experimental study of the population behavior of the nF 5/2 Rydberg states with principal quantum number n excited from the ground state by the two-step scheme 6P 1/2 → 6D 3/2 → nF 5/2 through the intermediate state 6 2 D 3/2 by using a collimated atomic beam and monochromatic radiation. Earlier [11], using this scheme, the energies and quantum defects of the Rydberg states nF 5/2 (n = 13-24) of the thallium atom were studied experimentally. The absorption of the tunable narrow-band laser radiation with λ = 276.9 nm at the 6 2 P 1/2 → 6 2 D 3/2 transition in an atomic thallium beam has been experimentally studied [12].…”