A curved-crystal x-ray emission spectrometer has been designed and built to measure 2-5 keV x-ray fluorescence resulting from a core-level excitation of gas phase species. The spectrometer can rotate 180 degrees, allowing detection of emitted x rays with variable polarization angles, and is capable of collecting spectra over a wide energy range (20 eV wide with 0.5 eV resolution at the Cl K edg...

Soft x-ray fluorescence spectroscopy has been employed to obtain information about the Si-derived valence band states of Fe/Si multilayers. The valence band spectra are quite different for films with and without antiferromagnetic interlayer exchange coupling, demonstrating that these multilayers have different silicide phases in their spacer layers. Comparison with previously published fluoresc...

Increasingly, attention is being paid to declaring the origin of agricultural and marine products after the advent of the bovine spongiform encephalopathy (BSE; commonly known as mad-cow disease). The display of the production centers on U. pinnatifida has been required in Japan since 2006. As an example of testing in another marine product, near-infrared spectra (NIR) and trace elemental analy...

Soft x-ray fluorescence spectroscopy has been used to examine the electronic structure of deeply buried silicide thin films that arise in Fe/Si multilayers. These systems exhibit antiferromagnetic (AF) coupling of the Fe layers, despite their lack of a noble metal spacer layer found in most GMR materials. Also, the degree of coupling is very dependent on preparation conditions, especially space...

in this research, gold nanoparticles were synthesized and functionalized by the antibody of aflatoxins. the quenching of the fluorescence of excitation emission matrices (eem) of two type of aflatoxins (b1, g1), provoked by the gold nanoparticles, was studied by principal component analysis (pca) and multivariate curve resolution with alternating least squares (mcr-als). these aflatoxins show q...

meso-Cyano boron-pyridyl-isoindoline dyes with asymmetrical structures were synthesized through a facile two-step reaction. Broad envelopes of intense vibrational bands were observed for the main spectral bands in the absorption and emission spectra. Moderate fluorescence quantum yields were obtained in solution, with significant intensity also observed in film, powder and crystal forms. An ana...

The aim of this research was to investigate the possibility of differentiation between black powder toners of similar polymer composition applying analytical methods: Fourier transform infrared spectrometry (FTIR) and X–ray fluorescence spectrometry (XRF). The studied materials were black powder toners of similar polymer composition sampled from the cartridges of 34 machines (31 models purchase...

The crucial role of state-dependent fluorescence yield was established previously [2-4]. Ab initio RAS-SCF approaches for transition-metal L-edge spectroscopy have been reported before [5, 6] and it was established that the state-dependence fluorescence yield for aqueous Cr arises from local atomic effects [4]. In contrast to the assertions in [1] that the analysis in [4] is mostly based on sem...

Rtms5 is an deep blue weakly fluorescent GFP-like protein ([Formula: see text], 592 nm; [Formula: see text], 630nm; Φ(F), 0.004) that contains a (66)Gln-Tyr-Gly chromophore tripeptide sequence. We investigated the optical properties and structure of two variants, Rtms5(Y67F) and Rtms5(Y67F/H146S) in which the tyrosine at position 67 was substituted by a phenylalanine. Compared to the parent pro...