In Table 6.1, there is a large gap in listing of Raman shifts between 1750 and 2800. Moreover the Raman spectra at those larger wavenumber values tend to be very broad and devoid of fine spectral features. Can you explain why?

Raman shift (cm Likely assignment \begin{tabular}{|l|} \hline 653673 \\ \hline 781790 \\ \hline 842855 \\ \hline 887905 \\ \hline 930939 \\ \hline \end{tabular} guanine cytosine, uracil tyrosine, lipid CH2 rock (lipid), structural protein C-C stretch (protein backbone) 978 phospholipid protein, phenyl-ring breathing \begin{tabular}{ll} 1062 & DNA/RNA, in-plane ring mode, phospholipid, C-C stretch \\ \hline 1084 & protein, C-N of protein backbone, phospholipid, O-P-O,C-C \\ 10551069 & C-C stretch (lipid) \\ 1090 & DNARNA, O-P-O, C-N of protein backbone \\ \hline 11621184 & aromatic amino acids, C-C stretch \\ \hline 11851211 & aromatic amino acids \\ \hline 12121290 & amide III, nucleic acid O-P-O \\ \hline 12911324 & CH2 twist (protein, lipid), nucleic acids \end{tabular} 1325-1424 CH2 twist and bend (protein, lipid), CH3 deformation (nucleic acids) 1435-1460 CH2 deformation (protein, lipid) 1562-1573 guanine, adenine 1609 aromatic amino acid (protein) 1652-1690 amide I ( C=O stretch), lipid (C=C) 1744C=O (lipid) 2723CCH3 28502936CH2 and CH3 symmetric, CH2 asymmetric (ipid), CH3 stretch (protein), CH (lipid, protein) 2940-2960 asymmetric CH3 (lipid and protein) 2979CH stretch (protein)