Laser-Induced Fluorescence Spectra of Some High-Sulphur Assam Coals, India

摘要

Coal is a carbonaceous material of sedimentary origin, which occurs as an intimate mixture of complex organic mass and inorganic matter. The product of partial decomposition of living materials laid down in sediments on death makes coal very complex. The use of laser radiation as an excitation source has a major impact on the study of the complex material, such as coal. A powerful coherent monochromatic laser source can serve a variety of applications, including sample-induced fluorescence. Thus, laser-induced fluorescence (LIF) provides, much as does Fourier transform infrared (FTIR) spectroscopy, fingerprints of different organic molecules, which can be quantified by measuring fluorescence intensities. Many workers have described the microscopic fluorescence characteristics of various types of macerals. Vitrinite, lip-tinite, and resinite are the most common fluorescing materials. Liptinite (much brighter than others) maceral fluoresce more brightly then vitrinites, which in turn fluoresce more brightly the inertinites. The fluorescence intensities depend upon the types of macerals, rank, and the degree of biochemical degradation in the peat swamp.