The displacement of an electrodeposited Cu monolayer on polycrystalline Pt by 2and 4-mercaptopyridine in solution has been investigated by XPS. The results indicate that, in both cases, the Cu adatoms are completely removed and substituted by mercaptopyridine molecules. An analysis of the S 2p spectra reveals a binding energy shift between adsorbed 2and 4-mercaptopyridine, associated with the d...

Radiative opacity of open-M-shell germanium plasmas in the L-shell photon energy region were investigated in detail by using a fully relativistic detailed level accounting approach. Among other physical effects such as relativistic and the interaction between fine-structure levels belonging to the same non-relativistic configuration and different configurations, particular attention is paid on ...

We have obtained photoelectron spectra (PES) for silicon cluster anions with up to 20 atoms. Efficient cooling of species in the source has allowed us to resolve multiple features in the PES for all sizes studied. Spectra for an extensive set of low-energy Si(-)(n) isomers found by a global search have been simulated using density functional theory and pseudopotentials. Except for n = 12, calcu...

We report the nuclear magnetic resonance ~NMR! spectra of phosphorus-doped single-crystal silicon, enriched to 97% Si, which display double as well as single peaks as the sample is rotated with respect to the static magnetic field. It is shown that the shape and the width of the NMR lines are predominantly due to nuclear dipolar interactions. We provide a theoretical model to determine the stre...

The reflection spectra of composite materials on a base of grooved silicon and grooved silicon infiltrated with nematic liquid crystal (LC) have been calculated using the optimal parameters of a grooved silicon matrix suitable for the infrared range. The grooved silicon structures with different lattice constants (A=16, 12, 8 and 4 μm) have been designed and prepared. An important parameter of ...

The electronic structure of the ferromagnetic semiconductor EuO is investigated by means spin- and angle-resolved photoemission spectroscopy (spin-ARPES) density functional theory. exhibits unique properties hosting both weakly-dispersive nearly fully polarized Eu $4f$ bands, as well O $2p$ levels indirectly exchange-split interaction with nearest neighbors. Our temperature-dependent spin-ARPES...

We measured the photoluminescence (PL) spectra of a series of Gen quantum wells as a function of temperature, from 2K to 50K. The PL spectra at 2.1K are dominated by broad emission lines, which can be interpreted as recombination across the indirect gap of the Si/Ge microstructure and are strongly in uenced by the interface morphology of each sample. Beyond T & 15K, all samples show identical s...

The growth mechanisms of small cationic silicon clusters containing up to 11 Si atoms, exohedrally doped by V and Cu atoms, are described. We find that as dopants, V and Cu follow two different paths: while V prefers substitution of a silicon atom in a highly coordinated position of the cationic bare silicon clusters, Cu favors adsorption to the neutral or cationic bare clusters in a lower coor...

Aluminum forms various structures on Si(100)-2×1. The most important of these are one-dimensional chains which are formed at room temperature and Si-Al clusters which can form c(4×12) reconstruction at temperature about 500 °C. STS spectra were measured above Al chains, in its close surroundings and above typical defects which are formed on the chains. One type of defect which appears at temper...