EUROPA IS A PRIME TARGET IN THE SEARCH FOR EXTRATERRESTRIAL LIFE AND POTENTIALLY HABITABLE ENVIRONMENTS BEYOND EARTH. THE MOON S HIGH ALBEDO AND LIMITED CRATER COUNT INDICATE A GEOLOGICALLY ACTIVE WORLD. MOREOVER ITS BULK DENSITY (BY EXTENSION ROCK/ICE RATIO) SUGGESTS THAT BENEATH THE YOUNG ICE CRUST EUROPA MAY HOST A GLOBAL SUBSURFACE OCEAN IN CONTACT WITH A SILICATE MANTLE PROVIDING A KEY PHYSICAL INTERFACE THAT MAY ENABLE: I) THE TRANSFER OF HEAT FROM THE DEEP INTERIOR TO THE OCEAN AND SURFACE; II) FLUID-MEDIATED/CATALYZED CHEMICAL EXCHANGE; AND III) THE CONCENTRATION OF ENERGY SOURCES (E.G. REDOX GRADIENTS) AND BIOAVAILABLE NUTRIENTS (E.G. CHNOPS). LOCALIZED SURFACE MORPHOLOGIES SUCH AS CHAOS TERRAINS AND HEMISPHERIC FRACTURES ASSOCIATED WITH MAJOR SALT DEPOSITS SIGNAL MASS EXCHANGE BETWEEN THE SUBSURFACE OCEAN AND THE ICE CRUST AND MAY PROVIDE SHELTERED NICHES FOR LIVING SYSTEMS AND RAW ORGANIC REACTANTS TO SURVIVE THE HARSH RADIATION ENVIRONMENT. WE PROPOSE TO DEVELOP CORALS A TRANSFORMATIVE LASER-BASED MASS SPECTROMETER THAT WILL REDEFINE OUR UNDERSTANDING OF EUROPA AS A POTENTIALLY HABITABLE WORLD THROUGH THE DETECTION/UNAMBIGUOUS IDENTIFICATION OF MOLECULAR BIOSIGNATURES AND THE CHEMICAL ANALYSIS OF SURFACE MATERIALS. THIS HIGHLY VERSATILE AND LOW SWAP (SIZE: 11 000 CM3; WEIGHT: 7.51 KG; AND POWER: 40.7 W PEAK) IN SITU INVESTIGATION WILL: 1) ANALYZE ABUNDANCE PATTERNS DISTRIBUTIONS AND DIVERSITY OF ORGANIC COMPOUNDS/FRAGMENTS; 2) CONSTRAIN SAMPLE PROVENANCE AND CRITICALLY ASSESS THE PROBABILITY OF BIOLOGICAL ORIGIN; 3) IDENTIFY MINERALOGY AND MAP CHEMICAL HETEROGENEITY WITHIN AND BETWEEN SAMPLES; 4) EVALUATE MASS TRANSFER AND/OR ISOTOPIC EXCHANGE ACROSS THE CRUST-OCEAN INTERFACE; AND 5) MONITOR PHYSICOCHEMICAL CHANGES IN SAMPLE PROPERTIES OVER THE MISSION LIFETIME. THE CORALS INSTRUMENT PIONEERS TWO CUTTING-EDGE SUBSYSTEMS: 1) A SOLID-STATE UV (266 NM) LASER OFFERING EXCEPTIONAL OUTPUT ENERGY (3 MOMA ENABLING GREATER IONIZATION DYNAMIC RANGE) CONTINUOUSLY VARIABLE ATTENUATION AND A MEMS STEERING MIRROR FOR ACTIVE BEAM SCANNING; AND 2) THE COSMORBITRAP MASS ANALYZER DEVELOPED FOR SPACEFLIGHT BY A COALITION OF FRENCH LABORATORIES AND CAPABLE OF DISCRIMINATING COMPETING ISOBARS WITH ULTRAHIGH MASS RESOLUTION (M/?M 100 000 FWHM AT MASS 100 DA) AND ACCURACY ( 3 PPM) FAR EXCEEDING HERITAGE SENSOR PERFORMANCE. AS CHRONICLED IN THE SCIENCE TRACEABILITY MATRIX THESE CRITICAL CORALS ELEMENTS CONSTITUTE A COMPREHENSIVE INVESTIGATION CAPABLE OF THE FOLLOWING: 1 )NONINVASIVE SPATIALLY-RESOLVED CHEMICAL IMAGING OF OCEAN RESIDUES SALT DEPOSITS AND RADIOLYTIC PRODUCTS VIA LASER DESORPTION/ABLATION MICROPROCESSING WITH A SCANNING BEAM; 2) QUANTITATIVE MEASUREMENTS OF TRACE LEVELS OF ORGANIC MOLECULES AND FRAGMENTS (PLUS MAJOR AND MINOR ELEMENTS) OVER A WIDE RANGE OF IONIZATION ENERGIES AND MOLECULAR WEIGHTS; 3) UNRIVALED DISAMBIGUATION OF ISOBARIC INTERFERENCES AND ISOTOPOLOGUES VIA ULTRAHIGH MASS RESOLVING POWERS AND PPM-LEVEL MASS ACCURACY; 4) STRUCTURAL ANALYSIS BY IN-SOURCE DECAY (ISD) AND COLLISION CROSS-SECTION EVALUATIONS; AND 5) HIGH-PRECISION DETERMINATIONS OF ABUNDANCE PATTERNS AND ISOTOPIC RATIOS.