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sWe have developed a mass- and charge-dependent equation to predict theoretical critical angles for ion channeling in carbon nanotubes We focus M (ion mass) effects how to reduce Ze (ion nucleus charge) effects on Psi(c) (critical angles). As an instance, we give theoretical critical angels of He, Ne, Ar, Kr, Xe and Rn ion channeling in carbon nanotubes We find that for (10, 10) single-wall carbon nanotubes, Psi(c)(He)approximate to:. Psi(c)(Ne) Psi(c)(Ar) Psi(c)(Xe)approximate to Psi(c)(Rn)approximate to 23 3 (keV/E)(1/2) deg This is because (Z/M)(1/2).--L- 066 lamur112 (C) 2010 Elsevier B V All rights reserved.