8 Raman spectra (a)1.3 GPa (b)2.3 GPa (c)4.1 GPa ν 4 : degenerate in-plane bend mode ν 1 : symmetric B-I stretch mode L xy : libration about in-plane axes T xy : in-plane translation intramolecular mode intermolecular mode ν1ν1 ν4ν4 L xy T xy Intensity (arb.units) Raman shift (cm -1)
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