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The strength of bonds also affects their vibration rates.
-butyl alcohol have been recorded using λ 2537 excitation.
However the full richness of the Raman spectrum can only be understood by considering the vibrations of larger groups of atoms (such as the expanding/contracting ‘breathing mode' of the aromatic carbon ring that appears at 1000 cm.
These originate from very heavy atoms or very large-scale vibrations, such as the whole crystal lattice vibrating.
The carbons in the former are part of carbon chains ('aliphatic'), whereas the carbons in the latter form part of carbon rings ('aromatic').