Hyperfine structure and lifetime measurements in the 4s(2)nd D-2(3/2) Rydberg sequence of Ga I by time-resolved laser spectroscopy

摘要

The hyperfine structure (HFS) constants of the 4s(2)nd D-2(3/2) (n=6-18) Rydberg sequence and the 4s(2)6p P-2(3/2) level for two isotopes of Ga-69 and Ga-71 atoms were measured by means of the time-resolved laser-induced fluorescence (TR-LIF) technique and the quantum beat method. The observed hyperfine quantum beat spectra were analyzed and the magnetic-dipole HFS constants A as well as the electric-quadrupole HFS constants B of these levels were obtained by Fourier transform and a program for multiple regression analysis. Also using TR-LIF method radiative lifetimes of the above sequence states were determined at room temperature. The measured lifetime values range from 69 to 2279 ns with uncertainties no more than 10%. To our knowledge, the HFS constants of this Rydberg sequence and the lifetimes of the 4s(2)nd D-2(3/2) (n=10-18) levels are reported for the first time. Good agreement between our results and the previous is achieved. (C) 2016 Elsevier Ltd. All rights reserved.