The current state of materials development in nonlinear optics is summarized, and the promise of these materials is critically evaluated. Properties and important materials constants of current commercial materials and of new, promising, inorganic and organic molecular and polymeric materials with potential in second- and third-order nonlinear optical applications are presented.
the primary step of eq 12. For the adsorbed phase, the secondary product C2H4 along with CO is observed.77 Acetylene photochemistry by 185 nm produces the radicals H* and C2H* in the gas phase and a number of secondary products.76 The adsorbed-phase reaction 13 is by contrast remarkably clean, with hydrogen exchange among isotopomers the only evidence for chemistry.78 Finally, 185-nm gas-phase photochemistry of S02 produces SO and 0 and secondary reactions generate S03.76 However no reaction for this system occurs in the adsorbed phase.79 It is likely that the arrangements of the excited adsorbed species play a crucial role in the resulting photochemistry.19 While the mechanisms of adsorbed-phase photochemistry on dielectric substrates have been explored for LiF(lOO),19,20 we view the understanding of simple adsorbed-phase reactions like those in eqs 12-14 to be essentially lacking.Finally, we turn our attention to the most poorly
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