State-selective single- and double-electron capture in collisions of low-energy S5+ ions with helium

State-selective single- and double-electron capture processes in collisions of S5+ ions with helium at energies ranging from 50.8 keV to 100 keV were investigated using cold target recoil ion momentum spectroscopy (COLTRIMS). Q-value spectra and projectile scattering angle distributions were obtained. For single-electron capture, single electron capture into n = 3 states of the projectile ion is dominant. As the projectile energy increases, the contribution of single electron capture into n = 4 states is observed. Experimental relative cross-sections for single-electron capture into different projectile final states were compared with theoretical predictions based on the molecular orbital close-coupling (MOCC) method. In double-electron capture, two-electron populating into the 3s23p and 3s3p2 states of projectile dominates. The reaction window calculated from the classical molecular Coulombic barrier model can qualitatively explain the experimental results. The scattering angle distribution of the multi-peak structure of the double-electron capture process is observed. The database is openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.j00113.00233.