Experimental investigation of the hyperfine structure of Tm I with Fourier transform spectroscopy, part A: In the visible wavelength range (400–700 nm)

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

“…Here, too, a revised value could be found with the appropriate lines (see Table 3). With this revised 𝐴 value, some lines of part A [1] were re-analyzed afterward and now show good agreement with our revised A values. [30]; int: intensity according to [8]; SNR: signal-to-noise ratio in the Tm-Ar spectrum;…”

“…The level at 24246.425 cm -1 has already been noticed as problematic in part A of this study [1]. Also in the present work, for several lines in which this level is involved the results did not fit well.…”

“…In the penultimate column, the weighted mean value 𝐴 mean is given, calculated using the error bars of 𝐴 exp as weights. For the calculation of the error bars, the same procedure is used as explained in Part A [1].…”

“…As described in detail in Part A [1], many studies of the spectrum of this element have already been carried out . All experimental investigations of the hyperfine structure (hfs) of atomic Tm from the last decades were carried out with lasers and were limited to the visible or near infrared (NIR) range below 1000 nm [9-14, 16-18, 20-25, 27, 28].…”

“…All experimental investigations of the hyperfine structure (hfs) of atomic Tm from the last decades were carried out with lasers and were limited to the visible or near infrared (NIR) range below 1000 nm [9-14, 16-18, 20-25, 27, 28]. Part A of this study [1] is also limited to the visible range. In the present work, the hfs of spectral lines in the NIR range up to 2250 nm is examined for the first time.…”