Table 1. Average flexing mode-shifts for selected assigned Raman modes. The central mode frequency and the rms magnitude of temporal frequency shifts is measured from a sample of 1000 measurements (ν = stretch, δ = bend).

Mode assignment	Centre Frequency (cm−1)	rms mode-shift (cm−1)
δ(CH2)	1339	6
ν(-C = O)	1700	6
ν(–[C = O]-O-C–)	1183	2.3
ν(PO2)	1239	3.0