Development of a multichannel Fourier-transform spectrometer to measure weak chemiluminescence: Application to the emission of singlet-oxygen dimol in the decomposition of hydrogen peroxide with gallic acid and K3[Fe(CN)6]

A Fourier-transform spectrometer equipped with a Savart-plate polarization interferometer was developed for observation of weak chemiluminescence and applied to a measurement of emission spectra in the decomposition of hydrogen peroxide with gallic acid and K3[Fe(CN)6]. The band appearing at ∼580 nm in the chemiluminescence spectrum was assigned to the emission of singlet-oxygen dimol, the peak wavelength being shifted from that observed in the reaction of hydrogen peroxide with sodium hypochlorite, ∼633 nm. The band intensity was increased with the increasing concentration of K3[Fe(CN)6] up to ∼100 mM, and thereafter the peak wavelength was shifted from 580 to 700 nm with a decrease in the intensity.