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In materials science the orientation of a crystal lattice is described by means of a rotation relative to an external reference frame. A number of rotation representations are in use, including Euler angles, rotation matrices, unit quaternions, Rodrigues–Frank vectors and homochoric vectors. Each representation has distinct advantages and disadvantages with(More)
Tunneling spectroscopy has been used to detect the photoexcitation of charge carriers in the wide-band-gap semiconductors, ZnO and cubic Sic. Photoexcitation, which increases the charge carrier population and thus reduces the width of the depletion layer at the semiconductor surface, is detected as an enhancement in the tunnel current. Because the process(More)
Fullerenes can act as inert cages for highly reactive nitrogen atoms even at room temperature. Confinement in a cage of less than spherical symmetry as realized in C70 leads to a characteristic deformation of the atomic charge and spin distributions which can be sensed by magnetic resonance techniques. A quantitative analysis of the amount of orbital(More)
The ReO3-type structure NbO2F, niobium dioxyfluoride, has been studied at high pressures using diamond anvil cells and synchrotron X-ray radiation. High-pressure powder diffraction measurements have been performed up to 40.1 GPa. A phase transition from the cubic (Pm3m) ambient pressure structure to a rhombohedral (R3c) structure at 0.47 GPa has been(More)
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