Table 1 Observed Raman bands and corresponding assignments for bulk reference compounds and CuCaO MMO catalysts

Ca(OH)₂

153

Lattice breathing mode

^81,82

280, 358, 690

OH⁻ ion vibrations relative to stationary Ca²⁺ ions—translational motion

^81,82

1089, 1156, 1262, and 1346

C–O and C=O vibrations in CaCO₃ from adsorbed CO₂

⁸³

CuO

275, 340

Cu–O and Cu–O–Cu vibrations

^84,85,86

CuCaO MMO

122–140

Lattice breathing mode

this work

518, 550, 615, 710

Cu–O(Ca²⁺)–Cu vibrations

^49,50,51 (and this work)