Radiative lifetimes and transition probabilities in Hf I and Hf III

Abstract

Radiative lifetimes of nine odd levels in Hf III (5d6p 23 P 0,1, z 1 D 2 , z 3 D 1,2,3 , z 3 F 2,3,4 ) and of two odd levels in Hf I (5d6s 2 6p z 3 D 2,3 ) have been determined using Time-Resolved Laser-Induced Fluorescence. The investigated levels in Hf I were excited in a single-step process from the ground term (5d 2 6s 2 a 3 F), whereas in Hf III we started from either the ground term 5d 2 a 3 F or the low-lying 5d6s a 3 D term. For all of the investigated levels, the lifetimes have been measured for the first time. A multiconfiguration relativistic Hartree-Fock method, including core-polarization effects, has been used to compute radiative lifetimes of 15 Hf III levels, including those measured in this work. Transition probabilities for 55 transitions in Hf III are also given.