Experimental Investigation of the Hyperfine Structure of Tm I with Fourier Transform Spectroscopy Part B: in the NIR wavelength range from 700 nm to 2250 nm

TL;DR

This study used Fourier transform spectroscopy to analyze the hyperfine structure of 43 spectral lines of atomic thulium in the near-infrared range, determining hyperfine constants for multiple levels, including new measurements.

Contribution

It provides new experimental data on hyperfine constants of thulium, including 14 first-time measurements and revised values for others, enhancing atomic spectral data accuracy.

Findings

Determined hyperfine constants for 17 levels, 14 of which are new.

Revised hyperfine constants for three levels significantly differ from previous reports.

Analyzed 43 spectral lines of atomic thulium in the 700-2250 nm range.

Abstract

In this study, we investigated the hyperfine structure of 43 spectral lines of atomic thulium. We analyzed Fourier-transform spectra in the wavelength range from 700 nm to 2250 nm, which corresponds to the wavenumber range from 14300 cm-1 to 4440 cm-1, respectively. The excited thulium atoms were generated in a hollow-cathode lamp. As a result of this investigation, the magnetic-dipole hyperfine constant A of 17 fine structure levels have been determined experimentally, 14 of them for the first time. The magnetic-dipole hyperfine constant values of the three remaining levels, reported in the literature, differed significantly from the results of our determination.