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Intensities in Tm I emission series originating from a common upper level aremeasured using a Fourier transform spectrometer. The derived relativetransition probabilities within each series are compared to the theoreticalpredictions obtained from large-scale calculations that combine configurationinteraction with many-body perturbation theory. Moreover, the Tm I spectrumrecorded in an external magnetic field is analyzed. Our theoretical resultswell describe the current measurements and show no more than a two-folddifference from previous experimental data on absolute transitionprobabilities. Additionally, Land\'e g factors, hyperfine structure constants,and atomic electric quadrupole moments for several levels of interest arecomputed and compared to experimental observations, where available.

Comparison of theory and experiment for radiative characteristics in neutral thulium