Measurement of hyperfine coupling constants of singly ionized rare earth ions

The detailed chemical abundance patterns of accreted halo stars from the optical to infrared

“…All the lines considered have reliable transition probabilities but are flagged to be possibly blended and are prone to HFS (Heiter et al 2021 ). HFS data for Nd were taken from Ma & Yang ( 2004 ) and Rosner et al ( 2005 ). We inspected the target 2M19104370-6001040 wherein all four Nd lines are present and give [Nd/Fe] = 0.49 ± 0.03 dex.…”

Theoretical analysis of 4f25d2 configuration of singly ionized praseodymium

“…Investigations of spectral lines of Pr II, published after 1989, were concerned with two features: either the measurements of transition probabilities and life times [9,10] or accuracy measurements of hyperfine structure constants for the levels already known using laser induced fluorescence (LIF) method in a hollow cathode [11] or on a fast ion beam method [12][13][14][15][16][17][18]. Using Laser spectroscopy method, Zeeman structure of 6 lines in the wavelength range 649.5728-669.351 nm was recorded [19].…”

New electron levels and classified lines in Pr II from hyperfine structure measurements

“…A correct classification of spectral lines, as well as the knowledge of possibly large numbers of electron levels, plays an essential role in astrophysics [1,2], where praseodymium spectral lines present in the spectra of CP stars are commonly used in investigations of nucleosynthetic processes in the universe. Spectral lines of Pr II, in particular their hyperfine structure, have been recently examined extensively with high precision spectroscopic methods [3][4][5][6][7][8][9] (in particular, on a fast ionic beam) in order to determine the parameters of interaction between the nucleus and the electron shells.…”