Applications of cyclotron based ion scattering

Ion scattering expts. were performed with a 3-30 MeV AVF cyclotron. The wide range of available energies combined with proper beam handling allows many scattering techniques to be performed. At 1st an example of ordinary Rutherford backscattering spectrometry will be demonstrated on model catalysts as studied in surface chem. High energy backscattering spectrometry with 8.8 MeV He ions, which enhances the sensitivity for O, was applied to study the O removal from corroded archaeol. artifacts upon treatment with a H2 plasma. Elastic recoil detection anal. is shown feasible with He ions having incident energies between 10 and 15 MeV once combined with a thin film detector. The development of a setup for ion channeling expts. with the cyclotron is reported and 1st results promise to increase the angular resoln. in lattice deformation studies. [on SciFinder (R)

The expanding thermal plasma as an intense source of SiH3 for the fast deposition of a-Si:H

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Hydrogen atom cleaning of archeological artefacts

For the development of H+ and H0 beams a new method was developed based on the expansion of a cascade arc plasma. A partial aim was to develop an intense beam of at. hydrogen. The result was a 100 A equiv. hydrogen atom beam with an energy conversion efficiency of typically 30-40%. The resulting hydrogen plasma was also used to do preliminary expts. on restoration treatment of archeol. artifacts according to the method of S. Veprek, et al. The present high d. atom rich plasma beam wit

Cleaning of iron archaeological artefacts by cascaded arc plasma treatment

An effective and fast way of restoration and preservation of archaeological artefacts is described. In this method a high intensity atomic hydrogen source plasma is used which expands in a low pressure treatment vessel. By nuclear techniques the removal of chlorine and the reduction of oxides to stable forms is monitored. It proves that both hydrogen atom reduction and thermal decomposition are important. In trial experiments with artefacts from a shipwreck followed by post-treatment a successful preservation has been shown. Also the removal of the dirt crust of the excavated artefacts was greatly facilitated in the treatmen