Browsing by Author "Schebela, H."

The 3 MV Pelletron tandem accelerator MaRPel (Material Research Pelletron) of the II. Physikalisches Institut in Gottingen 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 a N-15 beam with an energy higher than 6.385 MeV, which is the resonance energy of the H-1(N-15, alpha gamma)C-12 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. (c) 2005 Elsevier B.V. All rights reserved.

We report on the first measurements carried out with the new accelerator facility MaRPel (Materials Research Pelletron) in Gottingen. Samples of pure tantalum were irradiated with a pulsed nanosecond excimer laser in the UV wavelength range in a nitrogen atmosphere. The laser-nitrided tantalum samples were perfectly suited for testing a low-level set-up for resonant nuclear reactions analysis. The samples also allowed for a recalibration of the mass separator maanet, which was necessary after moving the 3 MV NEC-Pelletron from the Max Planck Institut fur Kernphysik in Heidelberg to the University of Gottingen. In addition, it is shown that the low-level set-up allows high resolution hydrogen depth profiling. (C) 2002 Elsevier Science B.V. All rights reserved.