Mars Analog Laser Induced Breakdown Spectroscopy Data - Los Alamos National Laboratory
As part of NASA PDART grant NNH15AZ89I, LIBS spectra of a suite of pressed powder samples were collected in the Spectroscopy and Magnetics Laboratory at Johnson Space Center (JSC) and on the ChemCam testbed at Los Alamos National Laboratory (LANL). ChemCam uses a Nd:KGW laser to produce 5 ns pulses of 1067 nm light. The laser is expanded through a 110 mm diameter Schmidt-Cassegrain telescope that is focused on the target at a range of up to ~7 m. All data listed here were collected at a range of 1.6 meters. The three spectrometers each have 2048 spectral channels, for a total of 6144 channels in a full spectrum, spanning the range 240.811 nm – 905.5735 nm. In the data files here, the first wavelength channel has been removed due to anomalously high values after preprocessing, so the spectra have 6143 channels. The LANL lab uses a small vacuum chamber to analyze samples under Mars-like pressures. The laser reaches the samples through a 6” diameter fused silica window on the side of the chamber. The samples analyzed at JSC had already been analyzed as part of the ChemCam calibration database at a pulse energy of 14 mJ. A subset of the samples were also analyzed at pulse energies of ~8 and ~11 mJ. Each sample was analyzed in five locations, with 50 laser pulses per location averaged together. As with the JSC data set, the data files also contain the XRF-derived compositions for each sample. The LANL spectra are provided in two forms: “cleaned, calibrated spectra” (CCS) and “no continuum removal” (NCR). CCS spectra (LANL CCS.csv) have been processed using the standard ChemCam preprocessing steps including dark subtraction, wavelength calibration, instrument response correction, and continuum removal (Wiens et al., 2013). NCR spectra (LANL_NCR.csv) have had all of the same steps applied with the exception of continuum removal.
- Mimetype
- text/csv
- Filename
- LANL_NCR.csv
- Author
- Ryan Anderson
- Originator
- Richard V. Morris, Trevor G. Graff, Sam M. Clegg, Los Alamos National Laboratory
- Group
- Astrogeology
- Added to Astropedia
- 6 May 2020
- Modified
- 11 May 2020
General
- Purpose
Data set of diverse, well-characterized geologic materials, analyzed by LIBS at multiple laser energies. With accompanying XRF compositions for development of regression models.
- Geospatial Data Presentation Form
- Spreadsheet
Keywords
- System
- Target
- Theme
- Mission
- Mars Science Laboratory
- Mission Specific
- Instrument
- Search Terms
- Laser induced breakdown spectroscopy, PyHAT, spectroscopy
Contact and Distribution
- Use Constraints
- Please cite authors
Geospatial Information
- Quad Name