Soft X-ray emission spectroscopy of aqueous myoglobin upon Fe 2p core excitation was carried out using a liquid cell with a 150 nm-thick polyimide window in a high vacuum chamber below 1×10−7 Pa. Fe 2p soft X-ray emission from the heme center of a met-myoglobin powder was effectively detected compared to that of an Fe2O3 powder. Fe 2p soft X-ray emission spectra for a series of aqueous-myoglobi...

We present a core level X-ray photoelectron spectroscopy study of NixMg12xO crystals with 0.03,x,1. We show that nonlocal effects involving inter-Ni-site fluctuations strongly influence the Ni 2p core-level spectra for higher Ni concentrations including NiO itself. It is only in the very dilute Ni limit that the core-level spectra can be described in terms of an Anderson impurity model which al...

We report on highly resolved core-level and valence-band photoemission spectroscopies of hydrogenated, unreconstructed 6H-SiC(0001) and (0001̄) using synchrotron radiation. In the C 1s core level spectra of 6H-SiC(0001̄) a chemically shifted surface component due to C-H bonds is observed at a binding energy (0.4760.02) eV higher than that of the bulk line. The Si 2p core-level spectra of SiC(0001...

Soft X-ray photoelectron spectra of Ar 2p levels of atomic argon and argon clusters are recorded over an extended range of photon energies. The Ar 2p intensity ratios between atomic argon and clusters' surface and bulk components reveal oscillations similar to photoelectron extended X-ray absorption fine structure signal (PEXAFS). We demonstrate here that this technique allows us to analyze sep...

in this article, hybrid organic-inorganic materials were prepared by free radical copolymerization of 2-hydroxyethyl methacrylate (hema) and 3-methacryloxy-propyltrimethoxysilane (mptms) via sol-gel process. the methoxysilane-containing copolymer precursors were synthesized at different compositions. these copolymer precursors were then hydrolyzed and condensed to produce phema-sio2 nanocomposi...

X-ray absorption spectroscopy at the L-edge probes transitions of 2p-electrons into unoccupied d-states. Applied to transition metal atoms, this experimental technique can provide valuable information about electronic structure However, multiplet effects, spin-orbit coupling, a large number possible cause rather involved nature 2p XAS spectra, which often complicate extracting directly from the...

The structures and IR spectra of CF3OCH3, CF3OCF2H, and CF3OCF2CF2H and corresponding alkanes CF3CH3, CF3CF2H, and CF3CF2CF2H have been calculated using the B3LYP method with a 6-311G(2d,2p) basis set. The calculated IR spectra are consistent with, and provide additional confidence in, the available experimental data.

A thick alumina sample was analyzed by hard x-ray photoelectron spectroscopy means of a lab-scale spectrometer equipped with Cr K? (5414.8 eV) excitation source. The reported spectra include survey scan as well Al 1s, 2s, 2p, O and C 1s core-level spectra.

La conjetura sobre la infinitud de los primos Germain, es decir, aquellos que “si p primo, 2p + 1 también primo“, se trata en este trabajo siguiendo un enfoque novedoso. Primero observa hay número infinito números no son Germain. Por lo tanto, si cantidad Germain infinita, una biyección con todos primos.
 Sin embargo, muestra haciendo extensión a definición obtiene esa biyección. Para logr...