Analytical Chemistry and Spectroscopy
Wiley InterScience Backfile Collection 1832-2000
Chemistry and Pharmacology
A resonance Raman method was developed for the study of a wide range of materials possessing UV chromophores with high sensitivity. The experimental arrangement, utilizing a low peak power yet high average power quasicontinuous-wave laser source, permits the study of both liquid and, for the first time, solid samples. Evidence for laser-induced sample degradation was observed from low levels of solid polycyclic aromatics dispersed in potassium chloride, but this was largely overcome by sample spinning. In addition, it was found that the Raman spectrum of individual components in a complex mixture can be selectively enhanced by a judicious choice of laser wavelength. Polyethylene and poly(vinyl chloride) were investigated and evidence for unsaturation was detected from both systems. This is attributed to the resonance enhancement of unsaturated moieties contained within the polymer.
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