Modern Polymer Spect..

3.11 A Vq> Siiiiplc Crrw: Luttice Djwmnics of HC1-DCI Mixed Crystals 135
100
glw i
50
0
Figure 3-19. Density of vibrational
states for a single mixed chain of (a) 3%.
jb) 25%, and (c) 45% DC1 in HC1 (chains
of 600 chemical units)
0 100
200 300 LOO 500
Figure 3-20. (a) Experimental
infrared spectrum in the HCI
and DCl stretching regions of
a mixed HCI/DCI crystal
contaiuiiig 25'X of DC1; (b)
g(i8) and (c) dipole-weighted
g[ i t) assuming a Lorentzian
band shape with Ai8,p = 2
cm-'. The observed spectra
have been shifted as indicated
for sake of qualitative coinparison.
A.
L
-A-
19.33 1950 1970
A
2ioo 2i20 2i~o 27ko