Anisotropy of Molecules

Emission Anisotropy of Fluorescence of Polar Molecules

The emission anisotropy (EA) of 4-Dimethyl-amino-4'nitrostilbene (DNS), 4-Amino-4'-nitrostilbene (ANS) and 2,5-Di(4-biphenylyl)oxazole (BBO) was observed to be decreasing with increasing dielectric constant e of the solvent. The effect is interpreted as an influence of the Onsager reaction field on the volume of the solvent shell, which in the excited state is smaller in solvents with larger e....

Tuning the Magnetic Anisotropy of Single Molecules.

The magnetism of single atoms and molecules is governed by the atomic scale environment. In general, the reduced symmetry of the surrounding splits the d states and aligns the magnetic moment along certain favorable directions. Here, we show that we can reversibly modify the magnetocrystalline anisotropy by manipulating the environment of single iron(II) porphyrin molecules adsorbed on Pb(111) ...

Anisotropy of polarized x-ray emission from molecules.

Ultrafast anisotropy dynamics of water molecules dissolved in acetonitrile.

Infrared pump-probe experiments are performed on isolated H(2)O molecules diluted in acetonitrile in the spectral region of the OH stretching vibration. The large separation between water molecules excludes intermolecular interactions, while acetonitrile as a solvent provides substantial hydrogen bonding. Intramolecular coupling between symmetric and asymmetric modes results in the anisotropy d...

Anisotropy of Magnetohydrodynamic Turbulence and Polarization of the Spectral Lines of Molecules

The anisotropy of velocities in MHD turbulence is demonstrated explicitly by calculating the velocity gradients as a function of direction in representative simulations of decaying turbulence. It follows that the optical depths of spectral lines are anisotropic when there is MHD turbulence, and that this anisotropy influences the polarization characteristics of the emergent radiation. We calcul...