  Context. Atomic data is crucial for astrophysical investigations. To
understand the formation and evolution of stars, we need to analyse their
observed spectra. Analysing a spectrum of a star requires information about the
properties of atomic lines, such as wavelengths and oscillator strengths.
However, atomic data of some elements are scarce, particularly in the infrared
region, and this paper is part of an effort to improve the situation on near-IR
atomic data. Aims. This paper investigates the spectrum of neutral scandium, Sc
i, from laboratory measurements and improves the atomic data of Sc i lines in
the infrared region covering lines in R, I, J, and K bands. Especially, we
focus on measuring oscillator strengths for Sc i lines connecting the levels
with 4p and 4s configurations. Methods. We combined experimental branching
fractions with radiative lifetimes from the literature to derive oscillator
strengths (f - values). Intensity-calibrated spectra with high spectral
resolution were recorded with Fourier transform spectrometer from a hollow
cathode discharge lamp. The spectra were used to derive accurate oscillator
strengths 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 the
near-infrared region for accurate spectral analysis of astronomical objects. We
derived 63 log(g f ) values for the lines between 5300{\AA} and 24300{\AA}. The
uncertainties in the f -values vary from 5% to 20%. The small uncertainties in
our values allow for an increased accuracy in astrophysical abundance
determinations.
