Guiding of 150keV O⁶⁺ ions through nanocapillaries in an uncoated Al₂O₃ membrane: special time dependence of the transmission profile width

This paper reports that the transmission of O^6 + ions with energy of 150keV through capillaries in an uncoated Al_2O_3 membrane was measured, and agreements with previously reported results in general angular distribution of the transmitted ions and the transmission fractions as a function of the tilt angle well fitted to Gaussian-like functions were observed. Due to using an uncoated capillary membrane, our \psi _\rm c is larger than that using a gold-coated one with a smaller value of \fracE_\rm pq, which suggests a larger equilibrium charge Q_\infty in our experiment. The observed special width variation with time and a larger width than that using a smaller \fracE_\rm p q were qualitatively explained by using mean-field classical transport theory based on a classical-trajectory Monte Carlo simulation.