E. Z. Tucker, M. Abedin, R. A. Wincheski, D. Rickman | 2024 | Acta Astronautica
DOI 10.1016/j.actaastro.2024.09.016Review state
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This paper characterizes NU-LHT-2M, NU-LHT-4M, and NUW-LHT-5M lunar regolith simulants using Raman spectroscopy to explore fluorescence and identify rare earth elements. It reports unique fluorescence peaks and potential applications in resource detection. The provided text appears to be a mix of metadata and content related to a scientific paper or article, likely involving Raman spectroscopy or similar analytical techniques. It includes information about the paper's title, authors, journal, and publication details, as well as links to various image files associated with the paper. The text also contains references to authors and other scientific works, suggesting it is part of a larger academic or research context. This study focuses on the characterization of three lunar simulant samples: NU-LHT-2M, NU-LHT-4M, and NUW-LHT-5M, using Raman spectroscopy. The research employs various systems, including a confocal microscope-based benchtop system with 532 nm and 785 nm excitation sources, and a fiber optic probe-based PhAT system. The Raman spectra are analyzed to identify mineral groups such as plagioclase (PLG), pyroxene (PX), and olivine (OLV). Background subtraction is performed
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Raman spectroscopy
analytical
ICP-MS and ICP-OES
analytical
Confocal microscope-based benchtop system results using a 532 nm laser
Raman spectroscopy
Confocal microscope-based benchtop system results using a 785 nm laser
Raman spectroscopy
Fiber optic probe-based system results
Raman spectroscopy
Standoff ultracompact Raman (SUCR) portable system results using a 532 nm laser
Raman spectroscopy
Raman characterization of NU-LHT-4M simulant
mineral identification
Comparison of Raman instrument configurations
instrument performance
Mineral groups
Plagioclase (PLG), Pyroxene (PX), Olivine (OLV)
Excitation sources
532 nm, 785 nm
plagioclase composition
higher calcium composition compared to plagioclase in many lunar simulants, including the NU-LHT series of simulants [17 ]
particle size
average particle size of approximately 70 m [8 ]
fluorescence features
distinctive fluorescence features between 870 and 890 nm attributed to a specific rare earth element (REE) impurity
Raman peak assignments
PLG (plagioclase), PX (pyroxene), OLV (olivine)
Background subtraction
Applied to remove fluorescence effects
Spectral features
Stronger, broader peaks above 1050 cm⁻¹ and much weaker, narrower peaks below 1050 cm⁻¹