Reorganization dynamics

Slow reorganization dynamics in the adsorbate/adsorbent complex after excitation of the Franck-Condon state. This could explain the spectral redshift of fluorescence with time (Figure 8.8, upper right, and Figure 8.9). In liquid solution, the excited state equilibrates on the picosecond timescale, but is has been shown(23) that this process can slow down on surfaces to 10-50 nsec. 

In a later study (DeKimpe et al., 1964) they demonstrated that it was necessary that the Al be in six-fold coordination before it would combine with Si to form kaolinite. Starting with the Al in six-fold coordination presumably decreased the free-energy barrier necessary for the formation of kaolinite. Gibbsite, Al(OH)3, was used as a starting material but was too stable to be attacked by depolymerized silica it was necessary for the gibbsite to be in the process of reorganizing ( dynamic stage) into boehmite, AIO(OH). 

TABLE 9. Reorganization dynamics of a-silylbenzylic lithium compounds in THF-dg solution... 

Further details of ion-pair reorganization dynamics ensued from NMR studies of 52. The low temperature, 160 K, 13C NMR of the geminal silyl methyls consists of three singlets in a 2 1 1 ratio. These were ascribed to two overlapping doublets, the larger peak being due to one line from each doublet see Figure 14. 

Benjamin and coworkers studied various aspects of ion dynamics near the liquid/ vapor and the liquid/liquid interface. Time-dependent probability distributions of the ion position were studied near the interface between immiscible apolar and polar liquids [198], The simulation results were in almost quantitative agreement with a one-dimensional diffusion model. Small differences were attributed to the solvent reorganization dynamics. Later this work was extended to the ion and solvent dynamics following charge transfer [199] near the same polar/apolar interface and to the liquid water/vapor interface [200],... 

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