Anisotropy negative

One can clearly see the large positive anisotropy in the [111] direction near the boundary of the first Brillouin zone (BZB). It is caused by the [111] high momentum component, which produces a continuous distribution of the momentum density across the BZB, as the Fermi surface has contact with the BZB in this direction. In the other directions, especially in [100], calculations show a steep decrease of the momentum density at the Fermi momentum and therefore a negative deviation from the spherical mean value. 

Figure 4. Momentum density anisotropy of Cu the solid line marks the boundary of the first Brillouin zone solid and dashed contour lines mark positive and negative anisotropies, respectively.

Fig. 14 are the simulated distributions including the different parent rotational levels. An interesting observation from these distributions is that the shape of the multiplet peak corresponding to each 011 (/I) rotational level for the perpendicular polarization is not necessarily the same as that for the parallel polarization see for example the peak labelled v = 0, N = 22. From the simulations, relative populations are determined for the OH (A) product in the low translational energy region from H2O in different rotational levels for both polarizations. The anisotropy parameters for the OH product from different parent rotational levels are determined. Experimental results indicate that the ft parameters for the 011 (/I) product from the three parent H2O levels Ooo, loi, I11, are quite different from each other. Most notably, for the 011 (/I, v 0, N = 22) product the ft parameter from the foi H2O level is positive while the ft parameters from the Ooo and In levels are negative, indicating that the parent molecule rotation has a remarkable effect on the product anisotropy distributions of the OH(A) product. The state-to-state cross-sections have also been determined, which also are different for dissociation from different rotational levels of H2O. 

Shi X, Basran J, Seward FIE, Childs W, Bagshaw CR, Boxer SG (2007) Anomalous negative fluorescence anisotropy in yellow fluorescent protein (YFP 10C) quantitative analysis of FRET in YFP dimers. Biochemistry 46 14403-14417... 

The value of A in the absence of motion is referred to as the limiting anisotropy, A0. This value is related to the relative direction of the absorption and emission dipoles. For tryptophan, /40is negative, which indicates that the absorption and emission dipoles are approximately perpendicular to each other.(83)... 

The VCD spectra of a series of chiral allenes have been recorded at the University of Minnesota using a dispersive VCD instrument (113). The spectrum of one of these compounds has been verified by FTIR-VCD (23). The molecules have a phenyl and a carboxyl substituent on opposite ends of the allene, and alkyl or hydrogen substituents in die remaining two positions. All the corresponding (S)-(+) enantiomers, 46, exhibit a single positive VCD feature and the (/ )-(-) enantiomers, 47, a negative VCD feature, at 1945 cm , with an anisotropy ratio of ca. 4 X 10 . 

Note 1 The nematic liquid crystal must have a negative dielectric anisotropy (Af < 0), and a positive anisotropy (Aa > 0). The optical texture corresponding to the flow pattern consists of a set of regularly spaced, black and white stripes perpendicular to the initial direction of the director. These stripes are caused by the periodicity of the change in the refractive index for the extraordinary ray due to variations in the director orientation. 

An alternative way of identifying the domain state of magnetite utilizes the dependence of both the crystal and strain anisotropy constants on temperature. Kj of eq. (7.2) is negative at RTand becomes positive at -118 K, which is the so-called Ver-wey transition at which the crystal anisotropy vanishes and any original remanence, which is controlled by this anisotropy, is lost. This provides an easy test for the do-... 

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