We report on a combined density functional theory and the experimental study of the O1s binding energies and X-ray Absorption Near Edge Structure (XANES) of a variety of oxygen species on Ag(111) and Ag(110) surfaces. Our theoretical spectra agree with our measured results for known structures, including the p(N× 1) reconstruction of the Ag(110) surface and the p(4 × 4) reconstruction of the Ag...

We present a systematic experimental study of absorption and fluorescence spectra of Au atoms in bulk liquid and solid helium matrices. The results are compared to the spectra of Cu atoms studied earlier. We investigate the dependence of the observed spectral lineshapes on the helium pressure. The observed splitting of the 5d(10)6p - 5d(9)6s(2) transitions of Au in hcp solid He gives evidence f...

In our effort to measure both the absorption and ionization spectra in a single experimental set-up, we have demonstrated that the column density not only affects strongly the structure profile of an atomic resonance but also alternates significantly the back ground cross sections in an ionization measurement. In addition, we present a procedure that, together with the peak cross sections estim...

Electromagnetically induced transparency (EIT) on atomic D1 line of rubidium is studied using a nanometricthin cell with atomic vapor column length in the range of L = 400 800 nm. It is shown that the reduction of the cell thickness by 4 orders as compared with an ordinary cm-size cell still allows to form an EIT resonance for L = λ (λ = 794 nm) with the contrast of up to 40 %. Remarkable disti...

Evidence that the fine structure constant, α = e 2 /¯ hc, was different in an early epoch has recently been found in quasar (QSO) absorption spectra. An accurate laboratory measurement of α variation could help to distinguish between space and time variation of α and possibly confirm the QSO results. We have performed calculations of the relativistic energy shifts that a variation of α would ca...

Hole and electron doped LaCoO3 is studied using dynamical mean-field theory. The one-particle spectra are analyzed and compared to the available experimental data, in particular the x-ray absorption spectra. Analyzing the temporal spin-spin correlation functions we find the atomic intermediate spin state is not important for the observed Curie-Weiss susceptibility. Contrary to the commonly held...

The influence of nitrogen excess on the optical response of N-rich Cu3N films is reported. The optical spectra measured in the wavelength range from 0.30 to 20.00μm have been correlated with the elemental film composition which can be adjusted in the nitrogen atomic percentage (at%) range from 27 ± 2 up to 33 ± 2. The absorption spectra for the N-rich films are consistent with direct optical tr...

Design of atomically precise metal nanocluster catalysts is of great importance in understanding the essence of the catalytic reactions at the atomic level. Here, for the first time, Au25(z) nanoslusters were employed as electron transfer catalysts to induce an intramolecular cascade reaction at ambient conditions and gave rise to high conversion (87%) and selectivity (96%). Electron spin-reson...

We report measurements of linear dichroism in x-ray absorption at Ti L(2,3) edges of a Mott-insulating ferromagnet YTiO3, where orbital ordering occurs in the triply degenerate Ti 3d t(2g) states. Dichroic spectra and their integrated intensities are obtained for the incident electric field with polarizations parallel to a, b, and c axes. The comparison of the spectra with atomic multiplet calc...

Electromagnetically induced transparency (EIT) on atomic D1 line of rubidium is studied using a nanometricthin cell with atomic vapor column length in the range of L = 400 800 nm. It is shown that the reduction of the cell thickness by 4 orders as compared with an ordinary cm-size cell still allows to form an EIT resonance for L = λ (λ = 794 nm) with the contrast of up to 40 %. Remarkable disti...