Miss MaRPel - a 3 MV pelletron accelerator for hydrogen depth profiling

The 3 MV Pelletron tandem accelerator MaRPel (Material Research Pelletron) of the II. Physikalisches Institut in Göttingen is equipped with a low-level target station for applying the Resonant Nuclear Reaction Analysis technique. This combination allows high-resolution hydrogen depth distribution profiling using a15N beam with an energy higher than 6.385 MeV, which is the resonance energy of the1H(15N,αγ)12C nuclear reaction. The installed AMSEL-steerers are used for an easy variation of the beam energy and a computer-controlled automated measurement of depth profiles. Here, the experimental set-up is described and the strategy of the energy calibration of MaRPel and the AMSEL-steerers is explained. The resolution and sensitivity of hydrogen depth profiling are presented together with some measured profiles as examples for possible applications of this analytic tool.