FT-IR and Raman spectroscopy for the study of amber and other fossil resins

Abstract

This study compares the FT-IR and Raman spectra of amber and other fossil resins from different world regions. The spectra of those resins were analysed based on absorption bands related to the vibrational frequencies of various functional groups present in these compounds. Both spectroscopic methods, FT-IR and Raman, are well-suited for the non-destructive identification of various fossil resins. It was found that FT-IR spectroscopy is particularly suitable for identifying Baltic amber due to its characteristic peak in the 1250–1175 cm–1 wavelength region. Raman spectroscopy can provide helpful information regarding the degree of maturation of resins. The presence of specific Raman bands, such as 1771–1543 and 1510–1400 cm–1, as well as 745 and 696 cm–1, can help determine not only the resin’s maturity but also any structural changes that occurred during burial over the geological time of different lengths.