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Figure 2
(a) Mid-infrared spectra of GSM122841 (blue curve) and YPM221210 (orange curve). Irradiation wavelengths of the MIR-FEL are indicated by arrows. (b) An optical microscope observation of fossilized coleoid inks on the slide base after irradiation tuned to 9.6 µm. (c) FT-IR spectra of hy­droxy­apatite before (grey) and after (black) the MIR-FEL irradiation at 9.6 µm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 1| January 2021| Pages 28-35
https://doi.org/10.1107/S160057752001406X
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