SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Focus Session: Ion Beam Interaction with Surfaces and 2D Materials II

O 13.2: Vortrag

Montag, 27. März 2023, 15:30–15:45, GER 38

Quantifying the erosion of the lunar surface due to solar wind sputtering — •Johannes Brötzner¹, Herbert Biber¹, Noah Jäggi², Paul Stefan Szabo³, Daniel Primetzhofer⁴, André Galli², Peter Wurz², and Friedrich Aumayr¹ — ¹TU Wien, Institute of Applied Physics, Vienna, Austria — ²University of Bern, Physics Institute, Bern, Switzerland — ³University of California, Space Sciences Laboratory, Berkeley, USA — ⁴Uppsala University, Department of Physics and Astronomy, Uppsala, Sweden

Without a protective atmosphere nor its own magnetic field, the lunar surface is subjected to bombardment by the solar wind, a stream of mostly H⁺ and He²⁺ ions originating from the Sun. Combined with other effects, this leads to the ejection of material and subsequently the formation of a tenuous gas layer around the Moon, the exosphere. Understanding its formation and coupling to surface properties could potentially enhance our knowledge of not only the Moon, but also other rocky bodies in the solar system.

Previous attempts at modelling the creation of an exosphere used sputter yield values of limited validity for the sputtering contribution to this process – data for relevant minerals were simply not available. While in the past few years, investigations using adequate analogue materials have progressed, we present both experimental and numerical results for the irradiation of H⁺ and He⁺ ions on samples prepared from actual lunar material, gathered during the Apollo 16 mission in 1972.