Engineering topics
Publications and source records attributed to Filipescu, N..
Laser activity is achieved in a solution of terbium tris at room temperature in a liquid solvent of acetonitrile or p-dioxane. After precipitation, the microcrystals of hydrated tris chelate are filtered, washed in distilled water, and dried. They show no signs of deterioration after storage.
Intramolecular triplet-triplet energy transfer between nonconjugated molecular chromophores held together by rigid molecular frame at known separation distance and mutual orientation
Liquid laser cavities have plenum chambers at the ends of the capillary cell which are terminated in transparent optical flats. By use of these cavities, several new europium chelates and a terbium chelate can provide laser action in solution at room temperature.
Photochemical transformation probe technique using collisional sensitization of fluorescence by positive trivalent Eu and Tb ions
Photoreduction of p, p prime-dimethoxybenzophenone /DMB/ in isopropyl alcohol for near UV irradiation, using trivalent Tb ion fluorescence to determine conversion
Europium complexes high resolution emission spectra in relation to molecular configuration
Fluorescence spectrum analysis of europic chloride dipyridyl chelates, deriving molecular geometric arrangement and interatomic distances from calculated ligand-field parameters
Photoreduction mechanism of benzophenone in isopropyl alcohol, obtaining phosphorescence and phosphorescence excitation spectra of In
Rare earth chelates fluorescence spectra correlation with molecular structure, analyzing emission spectrum internal Stark splitting of tetramethylammonium tetrakis /dibenzoylmethido/europate microcrystals
Stimulated emission and laser action from liquid solutions of gadolinium organic chelates at room temperatures
Spirocyclopropane formation and rearrangement in thermal and photochemical decomposition of 1-pyrazolines from 9-diazofluorene and bicyclic/2.2.1/olefins
Europium chelate liquid laser cavities construction and resonator design for lasing action at room temperatures
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Laser activity from terbium trifluoroacetylacetonate in p-dioxane and acetonitrile at room temperature
Spectroscopic properties of mixed complexes with two different ligand groups surrounding lanthanide ion, discussing energy transfer and absorption
Synthesis of model compounds and intramolecular energy transfer for organic laser materials, and sensitive rare earth fluorescence in organic solvents
High intensity triboluminescence in europium tetrakis /dibenzoylmethide/-triethylammonium crystals under mechanical impact
Fluorescence quantum efficiencies of octa- coordinated europium homogeneous and mixed chelates in organic solvents, noting effect of oxygen removal