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Simulation of surface regolith gardening and impact associated melt layer production under ns-pulsed laser ablation

Stojic, Aleksandra N. and Weber, Iris and Morlok, Andreas and Pavlov, Sergey G. and Hiesinger, Harald and Reitze, Maximilian P. and Maturilli, Alessandro and Schmedemann, Nico and Bauch, Karin E. and Pasckert, Jan Hendrik and Helbert, Jörn (2022) Simulation of surface regolith gardening and impact associated melt layer production under ns-pulsed laser ablation. Icarus, 391, p. 115344. Elsevier. doi: 10.1016/j.icarus.2022.115344. ISSN 0019-1035.

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0019103522004365


The effect of surface regolith gardening and melt layer production produced by space weathering (SW) (owing to micrometeorite bombardment) of surficial regolith layers of airless planetary surfaces was investigated in an experimental setup by using laser-induced ablation of powdered analog material (synthetic Fo100) under vacuum with a ns-pulsed infrared laser. The investigated analog pellets were prepared from the fine fraction (< 1 μm) up to a grain size of 280 μm, which resembles the uppermost regolith surface of many airless planetary bodies. The Fo-powder was pressed into shape to form a pellet. We focused here on nanometer-sized structural modifications that are induced in the relocated grains, sputtered off ejecta material and melt sprinkles that formed away from the craters caused by laser irradiation of the pressed pellet surface. The ejecta particles were redistributed over the entire pellet surface and beyond. The forming sputter film, melt sprinkles and ballistically ejected grains were caught on carbon film grids positioned nearby the craters. The grids were investigated with a transmission electron microscope (TEM) to discern between the distinct deposition types that were formed by ejecta condensate and partially molten ejected nanometer-size analog grains. Apart from a heavily modified pellet surface, we found that deposited droplets are mostly amorphous with minor nanocrystalline subdomains. Eight out of ten droplets show distinct incipient crystallization stages. This indicates at a relatively high amount of amorphous regolith material at the incipient stage of SW for airless bodies, if the regolith is altered via micrometeorite bombardment.

Item URL in elib:https://elib.dlr.de/196943/
Document Type:Article
Title:Simulation of surface regolith gardening and impact associated melt layer production under ns-pulsed laser ablation
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Stojic, Aleksandra N.Westfälische Wilhelms-Universität MünsterUNSPECIFIEDUNSPECIFIED
Weber, IrisWestfälische Wilhelms-Universität MünsterUNSPECIFIEDUNSPECIFIED
Morlok, AndreasInstitut für Planetologie, Westfälische Wilhelms-Universität Münster, GermanyUNSPECIFIEDUNSPECIFIED
Hiesinger, HaraldWestfalische Wilhelms-Universitat, Muenster, GermanyUNSPECIFIEDUNSPECIFIED
Reitze, Maximilian P.Westfälische Wilhelms-Universität MünsterUNSPECIFIEDUNSPECIFIED
Maturilli, AlessandroUNSPECIFIEDhttps://orcid.org/0000-0003-4613-9799UNSPECIFIED
Schmedemann, NicoInstitut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Strasse 10, 48149 Münster, GermanyUNSPECIFIEDUNSPECIFIED
Bauch, Karin E.Westfälische Wilhelms-Universität MünsterUNSPECIFIEDUNSPECIFIED
Pasckert, Jan HendrikInstitut für Planetologie, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, Münster, 48149, GermanyUNSPECIFIEDUNSPECIFIED
Helbert, JörnUNSPECIFIEDhttps://orcid.org/0000-0001-5346-9505UNSPECIFIED
Date:3 November 2022
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 115344
Keywords:Airless solar system bodies, Simulated space weathering, SW sensu lato, Micrometeorite impact, Glass formation, Regolith weathering, Earth Science
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project BepiColombo - MERTIS and BELA
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Laboratories
Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Helbert, Dr.rer.nat. Jörn
Deposited On:01 Sep 2023 10:55
Last Modified:19 Oct 2023 15:13

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