{'fraction_non_alphanumeric': 0.02209722780233025, 'fraction_numerical': 0.002812374447569305, 'mean_word_length': 5.5013054830287205, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Advanced Analytical Instrument Facility for Analysis of Return Samples from NASA Space Exploration Missions

Introduction: Chemical analyses of samples returned to Earth by space exploration missions, such as Genesis and Stardust, have one common feature even if they are conducted with very different analytical techniques: the samples are unique and irreplaceable. They belong to the class of atom-limited samples because the amount of sample material available for analysis is finite. Isotopic analyses of these samples are particularly challenging because they either alter or consume/destroy the precious samples. Under these conditions, minimized sample consumption by the analysis is extremely important. A key figure of merit of the analytical technique to be implemented in such cases is useful yield, the number of atoms consumed by the analysis divided by the total number of atoms available in the sample. Resonance Ionization Mass Spectrometry (RIMS), a variant of Laser Post-Ionization (LPI) Mass Spec-trometry (MS), became the technique of choice for many elemental and isotopic analyses because of its unique selectivity and high efficiency. To conduct analyses of samples delivered by NASA's Genesis mission, a new instrumental facility based on this method has been constructed at Argonne National Laboratory. A newly developed LPI MS instrument forms the core of the facility, which also includes a variety of advanced lasers for post-ionization. Experimental: The new instrument inherited its name from a decommissioned instrument, SARISA, (Surface Analysis by Resonant Ionization of Sputtered Atoms), to emphasize our continued commitment to developing analytical methods based on the synergy of mass spectrometry with laser post-ionization. The new generation SARISA [1] was specifically designed to minimize sample consumption during laser post-ionization analyses. This design has been perfected by advanced three-dimensional computer modeling. First, a " virtual reality " computer model of the instrument ion optics was developed with SIMION 3D software and thoroughly tested and optimized. When estimated analytical capabilities of the instrument met the requirements , another computer model, this time with Computer Aided Design software, AutoCAD 3D, was developed and optimized for the actual hardware that included all ion optics and all vacuum and mechanical components. In 2005, the construction of the new SARISA with all planned components was completed,