that only very limited structural heterogeneity exists in that sample. Thermal
annealing can cause drastic structural changes in the crystals thereby permanently
influencing the molecular dynamics. For the gypsum sample, annealing essentially
resulted in a nearly completely homogeneously broadened band (lower panel). Timedependent measurements additionally demonstrated that spectral diffusion is practically inexistent in the samples within a temporal observation window of about 15 ps.
In contrast to gypsum, water in basanite’s tubular channels shows completely different
spectroscopic behavior; that is, the data exhibit strong and dynamic disorder on the
picosecond timescale (Fig. 15b middle and lower panel). Depending on the
temperature, this partial sampling of the inhomogeneous lineshape was found to be
as slow as 30 ps. On much longer timescales considerable quasi-static inhomogeneous
Fig. 15 2D IR spectroscopy of the OD stretch band of HOD in a gypsum and b basanite. Top panels give
the crystal structure with the color-coding given in (b). Middle and lower panels give 2D IR spectra of
a fresh and annealed gypsum at T = 0.5 ps, and b indicated population delays at a temperature of 298 K.
Adapted with permission from Ref. [208]. Copyright American Chemical Society (2016)
Top Curr Chem (Z) (2017) 375:86
123
153
Reprinted from the journal
annealing can cause drastic structural changes in the crystals thereby permanently
influencing the molecular dynamics. For the gypsum sample, annealing essentially
resulted in a nearly completely homogeneously broadened band (lower panel). Timedependent measurements additionally demonstrated that spectral diffusion is practically inexistent in the samples within a temporal observation window of about 15 ps.
In contrast to gypsum, water in basanite’s tubular channels shows completely different
spectroscopic behavior; that is, the data exhibit strong and dynamic disorder on the
picosecond timescale (Fig. 15b middle and lower panel). Depending on the
temperature, this partial sampling of the inhomogeneous lineshape was found to be
as slow as 30 ps. On much longer timescales considerable quasi-static inhomogeneous
Fig. 15 2D IR spectroscopy of the OD stretch band of HOD in a gypsum and b basanite. Top panels give
the crystal structure with the color-coding given in (b). Middle and lower panels give 2D IR spectra of
a fresh and annealed gypsum at T = 0.5 ps, and b indicated population delays at a temperature of 298 K.
Adapted with permission from Ref. [208]. Copyright American Chemical Society (2016)
Top Curr Chem (Z) (2017) 375:86
123
153
Reprinted from the journal