AbstractWe have determined the absolute cross-sections σq and σq,q−1 both total and for one-electron capture for the processes Iq+ (6 ≤ q ≤ 30) + B → I(q−i)+ + Bj+ + (j − i)e− (B = Ne, Ar, Kr, Xe) at a collision energy of 1.5q keV. The absolute electron capture cross-sections were measured by the initial growth rate method. The experimental results for the initial charge state dependence of the total electron capture cross-sections were compared with the predictions of the extended classical overbarrier model.