Nearly Equidistant Single Swift Heavy Ion Impact Sites Through Nanoporous Alumina Masks

摘要

A semi-ordered pattern of 70 MeV Ag single ion impact sites on a fused silica sample was achieved by irradiation through a free-standing 10 μm through-pore ordered nanoporous alumina membrane. The membranes were fabricated by constant voltage anodization in oxalic acid with a two-step replication process. An apparatus and a method were developed to realize the alignment of the pores parallel to the ion beam. Measurements of the surface, by atomic force microscopy, confirm the presence of a semi-ordered pattern of single ion impact sites.