Ceriuii dioxide doped with y 3 + ions, which is of interest for its ionic conductivity, is here studied by anelastic ~~~ethods. The internal friction peaks observed are analyzed intc peals A , B, C (with Hr = 0.64, 0.71 and 0.78 eV, respectively). Peak A, present at low y3+ concentrations is established to be due to a W pair (V = oxygen-ion vacancy), which is a charged defect conpensated by an ...

Femtosecond optical pump-probe spectroscopy has been employed for studying the directly linked electron donor-acceptor system pyrene-N,N-dimethylaniline (PyDMA) in solid state. This DMA-pyrene derivative discussed is being applied as a molecular diode system switching on an ultrafast time scale. Our ultrafast solid-state studies reveal a complex photochemistry of this molecular crystal system. ...

The title compound, (C(12)H(10)BrFN)[Ni(C(3)S(5))(2)], is an ion-pair complex consisting of N-(2-fluoro-4-bromo-benz-yl)pyridinium cations and [Ni(dmit)(2)](-) anions (dmit = 2-thioxo-1,3-dithiole-4,5-dithiol-ate). In the anion, the Ni(III) ion exhibits a square-planar coordination involving four S atoms from two dmit ligands. In the crystal structure, weak S⋯S [3.474 (3), 3.478 (3) and 3.547 (...

We report experimental and theoretical studies on ring cleavage enhancement in collisions of potassium atoms with uracil/thymine to further increase the understanding of the complex mechanisms yielding such fragmentation pathways. In these electron transfer processes time-of-flight (TOF) negative ion mass spectra were obtained in the collision energy range 13.5-23.0 eV. We note that CNO(-) is t...

The title compound, (C(12)H(10)Cl(2)N)[Ni(C(3)S(5))(2)], is an ion-pair complex consisting of 1-(3,4-dichloro-benz-yl)pyridinium cations and [Ni(dmit)(2)] anions (dmit = 2-sulfanyl-idene-1,3-dithiole-4,5-dithiol-ate). In the anion, the Ni(III) ion exhibits a square-planar coordination involving four S atoms from two dmit ligands. In the crystal, weak S⋯S [3.368 (2) and 3.482 (3) Å], Ni⋯S [3.680...

In the title compound, [Zn(SO4)(C12H8N2)2]·C3H8O2, the Zn(II) ion is in a distorted square-pyramidal coordination environment composed of four N atoms from two chelating 1,10-phenanthroline ligands and one O atom from a monodentate sulfate ligand. The Zn(II) ion lies on a twofold rotation axis. The sulfate ligand and propane-1,2-diol mol-ecules are disordered across the twofold rotation axis. T...

High-Z materials exhibit a broad range of variation the charge state in hot dense regime, and so ionic structures become complex with increasing density temperature owing to ionization. Taking high-Z uranium as example, we study its electronic regime by combining an average-atom model hypernetted chain approximation. The structure is described solving Dirac equation, taking account relativistic...