ATR-FTIR spectra

ATR-FTIR spectra of a segment of waxy exudate (red spectrum) from the chinstrap loop on the PL side of the helmet matched with a reference spectrum of steric acid (green spectrum).
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Figure 9: ATR-FTIR spectra of a segment of waxy exudate (red spectrum) from the chinstrap loop on the PL side of the helmet matched with a reference spectrum of steric acid (green spectrum). Spectra courtesy of Thomas Lam, Smithsonian MCI. Spectrum collected with a Thermo Nicolet 6700 FTIR spectrometer with Golden Gate ATR.