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A model for the description of proton collisions from molecules composed ofatoms such as hydrogen, carbon, nitrogen, oxygen and phosphorus (H, C, N, O, P)was recently extended to treat collisions with multiply charged ions with afocus on net ionization. Here we complement the work by focusing on netcapture. The ion-atom collisions are computed using the two-center basisgenerator method. The atomic net capture cross sections are then used toassemble two models for ion-molecule collisions: an independent atom model(IAM) based on the Bragg additivity rule (labeled IAM-AR), and also theso-called pixel-counting method (IAM-PCM) which introduces dependence on theorientation of the molecule during impact. The IAM-PCM leads to significantlyreduced capture cross sections relative to IAM-AR at low energies, since ittakes into account the overlap of effective atomic cross sectional areas. Wecompare our results with available experimental and other theoretical datafocusing on water vapor (H2O), methane (CH4) and uracil (C4H4N2O2). For thewater molecule target we also provide results from a classical-trajectory MonteCarlo approach that includes dynamical screening effects on projectile andtarget. For small molecules dominated by a many-electron atom, such as carbonin methane, or oxygen in water we find a saturation phenomenon for higherprojectile charges (Q = 3) and low energies, where the net capture crosssection for the molecule is dominated by the net cross section for themany-electron atom, and the net capture cross section is not proportional tothe total number of valence electrons.

Net electron capture in collisions of multiply charged projectiles with biologically relevant molecules