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P: Plasmaphysik

P 17: Postersitzung: Plasma-Wand-Wechselwirkung III, Grundlegende Probleme Theorie II, Schwerionen- Laserplasmen II, Dichte Plasmen II

P 17.27: Poster

Mittwoch, 10. März 2004, 17:45–19:30, Foyer

Energy and emission distributions of ions in laser ablated plasmas from binary TiAl targets — •S. N. Srivastava and K. P. Rohr — Fachbereich Physik, Universität Kaiserslautern, Germany

The present work for the first time compares spectra of ion energy distributions in laser produced particle beams from pure metals with a series of its composite materials. Targets are Al and Ti and Ti25Al75, Ti34Al66, Ti50Al50 and Ti75Al25, respectively. The measurements are resolved for the different ion groups. The plasma was produced by obliquely incident Q-switched laser pulses (EL = 130 mJ, t = 5 ns and l = 1.06 mm) focused to an ablation area of about 0.3 mm2. Most apparent findings are: 1. The averaged particle energies increase with the charge and the atomic mass of the ions. This holds for all emission angles and for both pure and binary targets. 2. As a function of the ionic charge the angular emission cone steepens and moves towards the direction of the incoming laser beam. 3. The absolute values of the averaged energies of corresponding species in the monoatomic and complex beam are essentially equal.