urn:nasa:pds:context:instrument:mhc.chemlibs 1.2 1.25.0.0 Product_Context 2026-07-07 1.2 Removed duplicate Internal_Reference entries from Reference_List. 2025-12-24 1.1 Updated schema version. Removed instrument_to_investigation references. Adding missing "facility" references. 2025-01-23 1.0 Initial version. urn:nasa:pds:context:facility:laboratory.mhc instrument_to_facility ChemLIBS Spectrometer LIBS ChemLIBS has three Ocean Optics HR2000+ user-configured spectrometers and a Quantel Ultra100 laser operating at 1064 nm, up to 15 mJ/pulse, 10 Hz, with a 6-ns pulse width. An attenuator is permanently integrated into the laser, allowing power density to be varied to obtain data that match those acquired on Mars (~2 GW/cm2). A 50% beamsplitter is placed in the beam path to monitor laser energy. Any given laser attenuation values should be halved to calculate the laser energy on target. A 12-inch cube vacuum chamber houses the sample tray. Spectra were collected at three different laser energies under Earth (~760 Torr), vacuum (~100-300 mTorr), and a Mars-like (7 Torr CO2) conditions.