Theory of MX Chain Compounds - Material Designs and New Physical Properties in MX-and MMX-Chain Compounds - page 119

Fig. 8.8 Optical conductivity spectra without lattice fluctuation (a) and with lattice fluctuation
(b-d). The dotted curve in (b-d) is a Lorentzian fitted to the high-energy side of each peak.
Reprinted from Iwano and Nasu [ 18 ]

and

X

M T

mi;nj d mi;nj ðe m e i Þþ

Vf m ðlÞf n ðlÞf i ðl þ 1 Þf j ðl þ 1 Þ½l $ðl þ 1 Þ:

l

Uf m ðlÞf n ðlÞf i ðlÞf j ðlÞ : ð 8 : 20 Þ