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Extra info for Anisotropic Organic Materials. Approaches to Polar Order
P. Chem. Phys. Lett. 1992, 190, 75-82. ; M a i e r , M. J. Chem. Phys. 1987, 87, 809-820. W i l d , U. ; Güttler, F . ; Renn, A. Chem. Phys. Lett. 1992, 193, 451-455. K o h l e r , Β. , personal communication. Persistent Spectral Hole-Burning: Science and Applications; Moerner, W . ; Springer-Verlag: B e r l i n , 1988; Vol. 44, pp 315. Barker, J. ; N o e , L. ; Marchetti, A. P. J. Chem. Phys. 1973, 59, 1304-13. A l t m a n n , R. ; Haarer, D. J. Chem. Phys. 1992, 97, 5316-5322. A l t m a n n , R.
T o find out the in-plane alignment direction, we rotated the sample and recorded the second h a r m o n i c signal as a function o f the angle between the X and the polarization axes. A s shown i n Figure 4 D (15), w h e n the X axis is parallel to the p o l a r i z a t i o n a x i s , the S H G intensity reaches its m a x i m u m , and w h e n X is perpendicular to the polarization, it drops to zero. T h i s indicates that the molecules are preferentially aligned along the X axis. The above results h o l d for films o f 1 and 2 grown on silylated and bare glass, quartz, and i n d i u m tin oxide ( I T O ) substrates at substrate temperatures ranging from 3 0 ° to 1 0 0 ° C .
25,63,64], and (3) the electronic structure o f octatetraene is modeled w i t h a modified H u c k e l model . G i v e n the structure o f the local environment and the location and magnitude o f the point charges, the internal fields at the carbon atom sites o f O T can be calculated w i t h E q n . (2). In order to calculate the external field induced hole shifts, the local field has to be added to the internal fields, also atomically resolved. T h i s can be accomplished b y treating the polarizability o f a host molecule as the sum over the polarizabilities o f its bonds .