ARP Angle Resolved Photoemission DFT Density Functional Theory FT Frustrated Translation HATOF He Atoms Time of Flight HREELS High Resolution Electron Energy Loss Spectroscopy IRAS Infrared Reflection Absorption Spectroscopy L Longitudinally polarised mode LDA Local Density Approximation LDM Lattice Dynamical Model LEED Low Energy Electron Diffraction ML Monolayer NEXAFS Near Edge X-rays Absorp...

A method for electronic doping of colloidal CdSe nanocrystals (NCs) is reported. Anaerobic photoexcitation of CdSe NCs in the presence of a borohydride hole quencher, Li[Et3BH], yields colloidal n-type CdSe NCs possessing extra conduction-band electrons compensated by cations deposited by the hydride hole quencher. The photodoped NCs possess excellent optical quality and display the key spectro...

The most important organic compounds which absorb visible light can be classified into three groups typified: (a) by symmetrical polymethines, (b) bX"porphyrines, (c) by polyenes. Recently it was shown tnat the position of the absorption maxima of symmetrical polymethines and related compounds (symmetrical cyanine and oxanole dyes; Michler's hydrol blue and derivatives; malachite green and othe...

The cell transformation from green motile cells to non-motile cells and astaxanthin accumulation can be induced in the green alga Haematococcus pluvialis cultured outdoors. In the initial 3 d of incubation (cell transformation phase), light absorption and photosynthetic electron transport became more efficient. After five days of incubation (astaxanthin accumulation phase), the light absorption...

We study the optical absorption, especially the (far-) infrared absorption by phonons, of semiconducting and metallic nanospheres. In the nanoscopic sphere, phonons as well as states of electronic excitations are quantized by confinement. It is also known that in the nanoscopic geometry, the confined electron-phonon interaction has a different form from the usual one in the bulk. First, we anal...

We calculated optical absorption coefficients for linear and monolayer arrays of ionized quantum dots (QD) of spherical or cylindrical shape with random dimensions and occupation numbers, obtained by Monte Carlo simulation. When submitted to an oscillating electric field each ionized QD behaves as a dipole and the interaction of them changes the form of the light absorption. The effect of the m...

A novel hierarchical heterostructure of Ni microspheres-CuO nano-rices was fabricated using a simple two-step process. The CuO rices were densely deposited on the surfaces of Ni microspheres. The phase purity, morphology, and structure of composite heterostructures are characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectros...

A tight-binding parametrization of the band structure, along with a mean-field treatment of the Hund, electron-electron, and electron-lattice couplings, is used to obtain the full optical conductivity tensor of LaMnO3 as a function of temperature. We predict striking changes with temperature in the functional form and magnitude of the optical absorption. Comparison of our results with existing ...