The Optical Absorption Spectrum of Fluid Sulfur up to Supercritical Conditions

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Abstract
Optical absorption spectra in the range 0.5–4.9 eV (250 to 2000 nm) are reported for fluid sulfur up to 1100°C and at pressures up to supercritical pressures. An absorption band at 360 nm at 145°C is attributed to a few percent cyclo‐S6 (c‐S6) in the predominantly cyclo‐S8 (c‐S8) liquid. No anomaly in the rate of red shift of the absorption edge is observed at the polymerization temperature (160°C). Above this temperature an absorption band due to diradical chains is observed at low energy (∼1.4 eV). Investigation of the density dependence of the spectra of the dense fluid results from overlapping bands due to c‐S8, S3, and S4.

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