I am using microspheres to create optical crystal patterns on a glass substrate. The source is halogen lamp and detector is a CCD camera both on opposite side of the substrate. I see a broad absorption (-ln(P/P0)). The excitation spectra of the particles also look close but I believe it is usually taken by adding filters in the light path (epifluorescence microscopy etc.)

How can I be sure that the absorption I see is not due to the excitation spectrum? Do we expect to see the absorption due to excitation in broad spectrum as well? (380 nm - 750 nm)

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