Double-peak structures in transmission of H2+ ions through conical multicapillaries in a polymer: Projectile-energy dependence

<span style="color: rgb(51, 51, 51); font-family: arial, helvetica, sans-serif; font-size: 13px; line-height: 22px; background-color: rgb(248, 248, 248);">Transmission experiments of 7-200 keV H-2(+) ions through conical multicapillaries with inlet or outlet diameters of 4/2 mu m and a length of 30 mu m etched in a PC polymer are reported. The yield of the transmitted particles as a function of the capillary tilt angle was measured. The results show that for 200 keV H-2(+) ions the guiding effect disappears but a focusing effect is obtained with a density enhancement factor of 3.5. For 7-50 keV H-2(+) ions their transmitted particle curves exhibit a pair of shoulder peaks on the left-and right-hand side of the center angle 0 degrees. As the ion energy increases, the shoulder-peak structure is found to vanish leaving one peak at 0 degrees.