Investigation of the photoionisation spectrum of the second stage of lutetium photoionisation

Abstract: The photoionisation spectrum of the second stage of the three-stage photoionisation scheme of lutetium 5d6s^{2 2}D_3/2 – 5d6s6p ⁴F^o_5/2 – 5d6s7s ⁴D_3/2 – (53375cm^–1)^o_1/2 is studied. The degree of influence of two-photon transitions on photoionisation is experimentally investigated in comparison with the influence of one-photon stepwise transitions.

Keywords: laser selective photoionisation, ¹⁷⁷Lu isotope.