The far i.r. absorption spectrum of 4-cyano-4′-n-heptyl-biphenyl (HCB) in the fied-aligned nematic phase consists of a large number of sharp peaks, most of which are unresolved in the unaligned nematogen; the overall spectral intensity being considerably reduced by polarisation effects as field strength increases.
G. Evans and M. Evans, J. Chem. Soc., Chem. Commun., 1978, 267 DOI: 10.1039/C39780000267
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