A review is presented on recent developments in ultra-soft x-ray emission spectroscopy. Especially, instrumental developments related to high resolution studies of free molecules and to the use of synchrotron radiation are discussed. The most recent results from three different applications of ultra-soft x-ray emission spectroscopy are presented: electron excited spectra of free molecules, mono...

The results of deep long-slit optical spectroscopy for a sample of eight 6C radio galaxies at redshift z ∼ 1 are presented. Emission line ratios are derived for many emission lines with rest–frame wavelengths of 1500 − 4500Å and the kinematic properties of the emission line gas are derived from an analysis of the two dimensional structure of the [OII]3727Å emission line at ≈ 5Å spectral resolut...

We present an empirical template spectrum suitable for fitting and subtract-ing/studying the Fe ii and Fe iii emission lines in the restframe ultraviolet spectra of quasars and active galatic nuclei, the first empirical ultraviolet iron template to cover the full range of λ1250−3090Å. Iron emission is often a severe contaminant in optical– ultraviolet spectra of active galactic nuclei and quasa...

Highly crystalline and pure lithium metasilicate (Li2SiO3) and lithium disilicate (Li2Si2O5) nanomaterials were synthesized by hydrothermal method and characterized by PXRD technique. The changes in the morphology and particle size of the synthesized nanomaterials with reaction time were investigated using SEM technique. The UV-Vis and photoluminescence spectra of the compounds were studied. Th...

Two competing recombination mechanisms of stimulated emission in the vicinity of 145 K have been directly observed in the temperature dependence of the optical emission spectra for high-quality, unintentionally doped gallium nitride. Our analysis of the spectra indicates that exciton-exciton scattering is responsible for stimulated emission below 145 K, while at higher temperatures an electron-...

In evaluating the autofluorescence properties of normal and diseased skin we discovered that psoriatic plaques can emit a distinct red fluorescence when illuminated with UVA or blue light. Using a macrospectrofluorometer equipped with a 442 nm excitation laser, a sharp in vivo fluorescence emission peak around 635 nm could be demonstrated within the plaques of 34 of 75 (45%) patients with psori...

highly crystalline and pure lithium metasilicate (li2sio3) and lithium disilicate (li2si2o5) nanomaterials were synthesized by hydrothermal method and characterized by pxrd technique. the changes in the morphology and particle size of the synthesized nanomaterials with reaction time were investigated using sem technique. the uv-vis and photoluminescence spectra of the compounds were studied. th...

self-assembly of densely packed zno nanorods were grown on porous silicon (ps) substrate by low-temperature chemical bath deposition. the structural and optical properties of the obtained zno nanostructures on ps substrate were systematically studied. the strong and sharp (002) peak compared with other peaks in the x-ray diffraction (xrd) indicated thatzno nanorods formed with superior orientat...

zno nanowires with a diameter of 70 nm and nanorods with a diameter in the range of 100-150 nm and two micrometer in length were grown on glass substrates by resistive evaporation method and applying a two step oxidation process at low temperatures, without using any catalyst, template or buffer layer. xrd pattern of these nanostructures indicated a good crystallinity property with wurtzite hex...