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Showing 1 to 20 of 153 for “"emission spectra"”.
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Identification of chemical species using artificial intelligence to interpret optical emission spectra
… capabilities of ANN’s is that of optical emission spectra (OES). OES is an important diagnostic for monitoring plasma species within plasma processing. Normally, OES spectral interpretation requires significant prior expertise from a spectroscopist. One way of alleviating this intensive …
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Deconstructing the room-temperature emission spectra of nanocrystals using Photon-Correlation Fourier Spectroscopy
… is the result of the homogeneous "natural" spectra of single emitters subjected to interparticle inhomogeneities and perturbations from the environment. For semiconductor nanocrystals (NCs), efforts to tune ensemble linewidths for optical applications have focused primarily on eliminating …
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Spectrofluorometry: An Automated Dye Laser Spectrofluorometer for Obtaining Corrected Excitation and Emission Spectra on the Nanosecond Time Scale
Made available in DSpace on 2014-12-13T20:10:10Z (GMT). No. of bitstreams: 1 7803946.pdf: 6418126 bytes, checksum: 7a70b24f3c1a94883d9c96771923eb6f (MD5) Previous issue date: 1977
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Interaction cross sections needed for simulation of secondary electron emission spectra from thin metal foils after fast proton impact
Monte Carlo simulations of secondary electron emission from thin metal foils after fast proton impact require reliable interaction cross sections with the target under consideration. Total and energy differential inelastic cross sections have been derived for aluminum, copper, and gold thin-metal …
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Spectroscopic investigations of new glass-ionomer dental cements
Emission spectroscopy has been used to study conventional and resin modified glass-ionomer dental cements by monitoring the integrated peak intensities of signals arising from chromium ions in the aluminium oxide matrix as a function of reaction time.;Different conventional cements were prepared by …
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Spectroscopic Investigations of Light-Harvesting 2 Complexes from Rps. acidophila
… as singlemolecule fluorescence-excitation and emission spectroscopy at low temperature. The outcome of this thesis helps to clarify some long-standing problems concerning the discrepancies between the absorption and emission characteristics of ensembles of isolated LH2 complexes from purple …
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Photoluminescence in rare earth activated oxides and II-VI chalcogenides
… between the conduction and valence band. Emission spectra were found to be much sharper than in previously reported work. The narrowness of the peak appears to coincide with a reduction in particle size. With increasing cadmium concentration, this short wavelength (370 nm) emission band …
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Spectroscopic analysis of selected silicon ceramics
… of materials by measuring the absorption and emission of x-ray radiation. Absorption and emission spectra of these materials are presented, many of which have not be previously documented. The results are compared to model spectra and together they provide information about the electronic …
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Outer-core emission spectroscopy of the heavy alkaline-earth metals
Optical emission spectra from the np5 initial core-excited configurations of the alkaline-earth metals calcium, strontium, and barium are presented. The spectra are found to be anomalously broad and red-shifted with regard to XPS core positions. With the help of data from complementary core-level …
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Ensemble and single molecules fluorescence studies of polymers
… conformation on the photo-oxidation and green emission of poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) are investigated at both single molecule and ensemble levels. Single molecule studies reveal the conformation of PFO chains to be more globular when cast from THF than from toluene. Intensity …
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New Avenues in Atmospheric Modelling of Exoplanets
… paradigm for atmospheric retrievals of thermal emission spectra, as well as chemical detections using both high-resolution Doppler spectroscopy as well as low-resolution transit spectroscopy. I firstly computed the molecular and atomic cross sections of various species prevalent in the …
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Phosphors and photonic crystals
… ion) UV laser (257 nm) have been studied. The emissions have been assigned to their corresponding energy levels. Differences in the emission spectra of Y2WO6: RE, Y2O2S: RE, Gd2O2S: RE and Y2O3: RE have been attributed to the different site symmetries of the rare earth ions and to the different …
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Outer-core emission spectroscopy of the heavy alkaline-earth metals
Optical emission spectra from the np$\sp5$ initial core-excited configurations of the alkaline-earth metals calcium, strontium, and barium are presented. The spectra are found to be anomalously broad and red-shifted with regard to XPS core positions. With the help of data from complementary …
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A High Energy X-Ray Diffraction Investigation Of Sodium Phosphate Glasses Doped With Less Than 5 Mol% Praseodymium Oxides
… 0.04 < x < 0.13 showed that the intensity of the emission spectra increases with decreasing R<sub>2</sub>O<sub>3</sub> content. In this study, praseodymium doped sodium phosphate glasses with even lower praseodymium oxide concentrations, …
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Phosphorescence of a Series of Substituted Aceto- and Benzophenones in Crystalline form at Room Temperature
… to 1,1-dimethoxyethylene. | A recording emission spectrograph with lifetime measuring capabilities was constructed from available equipment. Emission spectra were obtained at room temperature from solid sample crystals formed on 2mm. soft glass rods. Lifetime data were gathered utilizing …
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Infrared Radiation of Metal Oxidation Chemical Reaction Flames
… energy transfer mechanisms and radiative emissions. Infrared spontaneous emission spectra have been calculated and a computer program written for least-squares determination of vibrational population distributions from experimental spectra.
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Studies of luminescent materials including novel preparation of phosphors
… region of the spectrum but the intensity of this emission is very weak when compared against a commercial red standard phosphor. However the novel preparation techniques utilising microwave technology could prove useful for the synthesis of nano sized tin oxide materials. For any group of chemical …
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Dissociation of carbon dioxide in atmospheric pressure microchannel plasma devices
… breakdown voltages lower than 1 kVRMS. Optical emissions of molecular and ionic fragments of carbon dioxide were observed in emission spectra of visible wavelength range measured through a transparent dielectric coated with ITO electrode. Quantitative analysis by mass spectrometry derived the …
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Development of magnesium tetraborate as a material for thermoluminescence dosimetry
… coactivation or sensitization effects. TL emission spectra were employed to evaluate the effects of co-doping.
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