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Context. Atomic data is crucial for astrophysical investigations. Tounderstand the formation and evolution of stars, we need to analyse theirobserved spectra. Analysing a spectrum of a star requires information about theproperties of atomic lines, such as wavelengths and oscillator strengths.However, atomic data of some elements are scarce, particularly in the infraredregion, and this paper is part of an effort to improve the situation on near-IRatomic data. Aims. This paper investigates the spectrum of neutral scandium, Sci, from laboratory measurements and improves the atomic data of Sc i lines inthe infrared region covering lines in R, I, J, and K bands. Especially, wefocus on measuring oscillator strengths for Sc i lines connecting the levelswith 4p and 4s configurations. Methods. We combined experimental branchingfractions with radiative lifetimes from the literature to derive oscillatorstrengths (f - values). Intensity-calibrated spectra with high spectralresolution were recorded with Fourier transform spectrometer from a hollowcathode discharge lamp. The spectra were used to derive accurate oscillatorstrengths and wavelengths for Sc i lines, with emphasis on the infrared region.Results. This project provides the first set of experimental Sc i lines in thenear-infrared region for accurate spectral analysis of astronomical objects. Wederived 63 log(g f ) values for the lines between 5300{\AA} and 24300{\AA}. Theuncertainties in the f -values vary from 5% to 20%. The small uncertainties inour values allow for an increased accuracy in astrophysical abundancedeterminations.

Laboratory oscillator strengths of Sc I in the near-infrared region for astrophysical applications