Figure 7.

The ASR_K minus ASR (a) and the BR_K minus BR (b) spectra in the 1,800–850 cm^-1 region measured at pH 7 and 77 K upon hydration with H₂O (solid line) and D₂O (dotted line), respectively. In the hydrated film, ASR molecules are oriented randomly, while BR molecules are highly oriented. Spectrum in (b) is reproduced from Kandori et al. [28], where the sample window is tilted by 53.5°. One division of the y-axis corresponds to 0.005 absorbance units. This figure is reprinted with permission from Furutani et al. [20]. Copyright 2005 American Chemical Society.