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Angular distribution and current dependence of the transmitted ion fraction are investigated for 40keV Xe7+ bombarding on polycarbonate (PC) nanocapillaries.By measuring the angular distribution of the transmitted ion fraction,a strong guiding effect is found in PC nanocapillaries.Furthermore,with increase of the incident current,a tuing point of the transmitted ion fraction is found,which is explained qualitatively by the discharge capacity of the nanocapillaries.