Abstract
A new set of radiative decay parameters (oscillator strengths, transition probabilities) for spectral lines in triply ionized thulium (Tm IV) has been obtained within the framework of the pseudo-relativistic Hartree-Fock (HFR) approach. The effects of configuration interaction and core-polarization have been investigated in detail and the quality of the results has been assessed through a comparison between different HFR physical models. The spectroscopic data listed in the present paper cover electric dipole as well as magnetic dipole and electric quadrupole transitions in a wide range of wavelengths from extreme ultraviolet to near infrared.
Highlights
Because of their unusual luminescent properties, triply charged lanthanide ions find many applications in different scientific and technological fields such as the lighting industry, photonics, laser physics and biotechnology, see e.g., [1,2,3,4,5,6]
Its emission spectrum has been studied in various compounds such as, for example, in thulium ethylsulphate [7,8], in CaF2 [9], in CaWO4 [10,11], in YVO4 [12], or in LiYF4 [13]
Paris-Meudon Observatory, these authors were able to identify more than 760 lines as transitions between 157 levels of 4f11 5d, 33 levels of 4f11 6p, 9 levels of 4f11 6s and 10 levels of the 4f12 ground configuration in Tm IV
Summary
Because of their unusual luminescent properties, triply charged lanthanide ions find many applications in different scientific and technological fields such as the lighting industry, photonics, laser physics and biotechnology, see e.g., [1,2,3,4,5,6]. If we except La3+ , all these ions are characterized by a ground electronic configuration of the type [Xe]4fk with k varying from 1 (Ce3+ ) to 14 (Lu3+ ), which is mainly responsible for their interesting photophysical properties such as long-lived luminescence and sharp absorption and emission lines Until recently, their radiative properties were essentially investigated from spectroscopy experiments on ions embedded in compounds or crystal lattices. Let us mention that triply ionized thulium has been proposed as being suitable for ultraprecise atomic optical clocks with naturally suppressed blackbody-radiation shift of clock transition frequency [15] This ion has ground and long-living first excited states belonging to the 4f12 configuration, giving rise to electric quadrupole transitions within the optical or infrared wavelength range. These calculations are an extension of our previous investigations of triply ionized lanthanides La IV [17], Ce IV [18], Pr IV [19], Nd IV [20], and Yb IV [21]
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