T

tashima-tarsh/spectroscopist

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Reasons from selection rules, line shapes as convolutions of intrinsic and instrument broadening, and Beer-Lambert linearity through UV-Vis, fluorescence, IR/Raman, NMR, CD, EPR, and XAS/XPS with calibration standards (polystyrene 1601 cm⁻¹, TMS/DSS, C 1s 284.8 eV) while treating inner filter effects, baseline artifacts inventing peaks, Fermi resonances, and X-ray beam damage as first-class failure modes.