Transport of ions in sources with ionization at atmospheric pressure. II. Inverse geometry

An experimental study and numerical modeling of the influence of the geometric and electrical parameters of ion sources with ionization at atmospheric pressure for inverse geometry on the transport of ions from the ionization site to the entrance to the analyzer vacuum interface is carried out. The possibility of increasing the ion current extraction from the primary flow of charged particles by several times is shown in comparison with the traditional geometry with the minimum possible losses in a dense gas. The effect on the flux of scattering ions in a dense gas and space charge is of secondary importance in the investigated ion source geometry