{"thcode":2,"term":{"code":955,"name":"Raman spectroscopy","parent":619,"scope":"Non-destructive chemical analysis technique in which a sample of material is irradiated with visible or near-infrared light from a laser, and the wavelength-dependent observations are used to understand chemical structure, phase and polymorphy, crystallinity and molecular interactions of the material."},"uf":[],"bt":[{"code":619,"name":"laboratory methods","parent":734,"scope":"Techniques to analyze and test samples in a place equipped and designed for the work."},{"code":734,"name":"methods","parent":1,"scope":"Techniques, methods, procedures, or strategies for research, management, collection, or analysis of scientific information in USGS."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":2304,"name":"graphite","parent":798,"scope":"Mineral commodity composed of carbon arranged in sheet structures used in many ways, most recently in battery technology."},{"code":2279,"name":"thermal maturation","parent":435,"scope":"Chemical alteration of organic material within sediments and sedimentary rocks as a result of heat. Measures of thermal maturation indicate the extent of transformation of detrital organic material into coal and petroleum."}]}