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An exploration of the potential use of a CCD camera for absorption spectroscopy in scattered light at the rainbow

The advent of the CCD camera has made it possible to record light intensity as a function of two dimensions. In this paper, we have explored the camera's potential to measure spectra in scattered light at the rainbow by recording the intensity as a function of angle and wavelength. To this end, white light from a xenon arc lamp was scattered from water sprays containing various concentrations of water-soluble food dyes. Comparisons were made with theoretical spectra calculated using Mie theory Qualitatively agreement was excellent. Quantitatively agreement was reasonable, but there were some discrepancies as yet to be explained. Although the main rainbow is insensitive to the particle size distribution, if concentration of the absorbing species is to be recovered accurately an independent means of determining the particle sizes will be necessary.