Measured with: Ocean Optics Jaz spectrometer, 600µm core optical fibre and a diodelaser 405 nm.
The fluorescence of the calcium-dihumate complex in acetone, compared to some of the orange fluorescing specimens from the fluorescence survey of the Turkish borate minerals. The spectra have been genormalised.
The tell-tale vibronic emission peaks of the calcium complex with humic acids are much more outspoken in the spectrum of the weakly red fluorescing crystal faces. Faster growth allowed for a better absorption of this substance in the largest crystal faces than in the smaller ones.
A real broadband spectrum, as we expect from enclosed organic material, various defects of non-interconnected oxygen and replacement of borate ion by other anions. In This spectrum two blazes of the diffraction grating and the second order of the excitation peak are removed.
