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IR spectra of isophorone ice for the regular (upper trace) and d5-substituted (lower trace) forms formed at 100 K on Pd(111). Three main spectral regions can be distinguished characteristic for C–H stretching (2800–3200 cm–1), C=C and C=O stretching (1550–1850 cm–1), and C–H, C–D, and C–C deformation vibrations (<1500 cm–1).
