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High-pressure behaviour of α-glycine has been investigated up to ∼23
GPa using Raman scattering technique. The experimental results show slope change in the CO
2 bending, NH
3 torsional and NH
3 rocking modes around 3
GPa and are interpreted in terms of change in the nature of an N–H⋯O–C intra-layer hydrogen bond at this pressure. Several other spectral features seem to arise from pressure-induced variations in the inter-molecular coupling.