I am getting multiple peaks in the absorption spectra of my inorganic compound, There are not any secondary phases found confirmed by Raman. I suspected they might be interference fringes but don't know how to confirm it. and i am also seeing trend that more crystalline the material more fringes observed. what are the possible explanations ?
Even most simple molecula like H2 has extremely complicated spectrum due to excitation different electronic, vibrational and rotational transitions. So You observe typical absorption electronic spectra broadened due interaction with molecular vibrations and phonon of matrix. Number of registered absorption bands of different origin will increase when You increase your excitation spectra in UV and IR region.
Different functional groups may show different absorptions and even a single functional group may exhibit two signals in your UV-VIS spectrum, e.g. corresponding to π-π∗ or n-π∗ transitions
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