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DS: Fachverband Dünne Schichten

DS 36: Poster Session I

DS 36.70: Poster

Donnerstag, 19. März 2015, 09:30–12:00, Poster A

Noble gas ion-induced ripple pattern formation on carbon surfaces — •Omar Bobes, Kun Zhang, and Hans Hofsäss — Georg-August-Universität Göttingen, II. Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

We present here some experiments for Ne, Ar and Xe ion irradiation of amorphous carbon surfaces as function of ion incidence angle and for a rather broad ion energy regime between few hundred eV and 60 keV. We find a disappearance of patterns for Ne and Ar ion irradiation at intermediate ion energies of several keV. Patterns reappear again hat even higher ion energies. Monte Carlo simulations of the curvature coefficients applied to the Bradley-Harper and Carter-Vishnyakov models, including the recent extensions are able to explain the absence of pattern formation in certain cases. Moreover, simulations indicate that pattern formation on a-C should be possible for low energy Ne ions and even He ions with 250 eV. Indeed we find ripple patterns for 950 eV Ne irradiated a-C. Our experimental results are compared with predictions using current linear theoretical models and applying the crater function formalism as well as Monte Carlo simulations to determine curvature coefficients.