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EP: Fachverband Extraterrestrische Physik

EP 7: Planets and small Objects I

EP 7.5: Vortrag

Donnerstag, 2. April 2020, 12:15–12:30, H-HS VIII

Laboratory studies on laser-induced plasma shockwaves for LIBS measurements on Mars — •Fabian Seel^{1, 2}, Susanne Schröder¹, David Vogt¹, Peder Hansen¹, and Michael Gensch^{1, 2} — ¹Institut für Optische Sensorsysteme, DLR, Berlin, Germany — ²IOAP, TU Berlin, Germany

With the upcoming launch of the NASA Mars 2020 rover, a new mobile laboratory will be on the way to Mars. The rover will carry the sensor suite SuperCam, combining different spectroscopic methods to study the composition of geological samples at the rover’s landing site. One of the applied methods is laser-induced breakdown spectroscopy (LIBS). For the first time, the rover will also carry a microphone to detect audible signals from Mars, which can also be used to improve the analysis of the LIBS measurements [Space Sci. Rev. 2012, 170:167-227., Spectroscopy 2017, 32.]. When taking a LIBS measurement, a pulsed laser is used to generate a plasma that can be analysed spectroscopically. An acoustic wave is emitted from the pressure shock of the expanding plasma plume that can be recorded to gain insight into material properties and laser-matter interaction [Spectrochim. Acta B 2019, 153:50-60., EPSC 2017, #239]. The laser-induced plasma in experimentally simulated Martian atmospheric conditions is studied with temporally and spatially resolved spectra. We investigate the plasma and its shockwave for applications on Mars in particular to link the acoustic signal to the LIBS spectral features [LPSC 2019 #2793]. First results will be presented here.