Abstract
Nonlinear optical techniques are emerging as powerfulin-situprobes of crystallization processes due to their inherent sensitivity to crystal structure and morphology.
Highlights
Crystalline materials are ubiquitous in all realms of science, industry and nature
We provide a perspective on various nucleation and crystal growth studies that were carried out by nonlinear optical probing techniques
The results showed a linear increase of the intensity with a maximum being reached at a molar ratio of 1 : 1. Addition of methanol to the solution lead to dissociation of the complexes due to competition to form H-bonds, resulting in a decrease of SHS.[67]
Summary
Crystalline materials are ubiquitous in all realms of science, industry and nature. They are essential components of modern technologies, and determine the performance and processing of pharmaceuticals, catalysts, molecular sieves, and so on. The orientation of large particles is normally fixed and orientational averaging is not required In this case the Review number of experimentally accessible observables increases significantly.[27,29] Since the signal for large particles is significantly higher, full polarimetric analysis during crystallization becomes realistic at high time resolution.[43,44] Even when full characterization of the v(2) and v(3) tensor is not possible, techniques such as Fourier or principle component analysis can be applied to discriminate between crystal structures or to probe local order, with the added advantage that these techniques are significantly faster in terms of data analysis.[43,44,45]. In crystallization studies this approach might help minimizing unwanted effects such as laserinduced nucleation
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