A unique approach to the vapour phase of the HIx feed of the sulfur iodine thermochemical cycle: A Raman spectroscopy study

Exploiting H2 coherent anti-Stokes Raman spectra and an adapted Arrhenius plot, the activation energy for HI decomposition was estimated to be 149.15 kJ/mol, for a given hyper-azeotropic composition of the HI-I2-H2O system.98