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1Author    V. Tabakova, R. TrifonovaRequires cookie*
 Title    On the Shortwave Emission of Ga-activated Single Crystals of BaCl 2  
 Abstract    The luminescence of BaCl 2 -Ga single crystals at temperatures down to liquid helium under excitation with different energies is studied. The emission consists of several bands, the intensities of which depend on the temperature and the exciting energy. The excitation spectra of the different emission bands measured at 4 K, 78 K and 293 K are also reported. The results indicate the coexistence of centres of different structure and composition. The Jahn-Teller effect might also take place. 
  Reference    Z. Naturforsch. 45a, 657—660 (1990); received September 13 1989 
  Published    1990 
  Keywords    Luminescence, Barium chloride, Emission, Excitation 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0657.pdf 
 Identifier    ZNA-1990-45a-0657 
 Volume    45 
2Author    Sn Bakalova, P. Nikolov, E. Stanoeva, V. Ognyanov, M. HaimovaRequires cookie*
 Title    Luminescence Properties and Electronic Structure of Some Quinolizinone and Indolizinone Derivatives  
 Abstract    The absorption and luminescence static and dynamic properties of a group of quinolizinone and indolizinone derivatives in solvents of different polarity at 297 K and 77 K are studied. On the basis of the spectral data and the PPP quantum-chemical results the problem of the main chromophore in these structures is discussed. 
  Reference    Z. Naturforsch. 47a, 521—526 (1992); received October 29 1991 
  Published    1992 
  Keywords    Absorption, Luminescence, Quinolizinones, Indolizinones 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0521.pdf 
 Identifier    ZNA-1992-47a-0521 
 Volume    47 
3Author    G. Blasse, G. J. DirksenRequires cookie*
 Title    Luminescence of CS3V2O4F5  
 Abstract    The compound CS3V2O4F5 with statistically distributed [V204F5] 3 ~ complexes shows a weak, red emission at low temperatures. This emission is discussed in relation to similar luminescent compounds. 
  Reference    Z. Naturforsch. 38b, 788—789 (1983); received March 9 1983 
  Published    1983 
  Keywords    Luminescence, Vanadate, Niobate, Tungstate 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0788_n.pdf 
 Identifier    ZNB-1983-38b-0788_n 
 Volume    38 
4Author    Peter Morys, Sabine SchmerbeckRequires cookie*
 Title    Über die Photolumineszenz von Oberflächenverbindungen des Molybdäns auf Silicagel On the Photoluminescence of Molybdenum Surface Compounds on Silicagel Supports  
 Abstract    The UV induced photoluminescence (PL) of activated and reduced surface molybdenum com-pounds on silica gel has been studied at various concentrations of the products under He and Ar and at various temperatures from R.T. to 10 K. With the activated molybdenum(VI) compounds, four different types of broad band emissions were observed and assigned to definite surface species of Mo(VI): A blue PL occurring mainly at T > -90 °C, two "white" emissions with different spectral excitation regions and Stokes shifts appearing very strongly under He or vacuum below T < —90 °C and a yellow PL occurring with the products under Ar, N 2 or C0 2 instead of the "white" ones. While the blue PL was ascribed to an octahedrally coordinated surface species (Moc 1), the two "white" emissions were attributed to two tetrahedrally coordinated surface species, the first one (MoX 1) being monomeric and bonded directly to the surface, the second one (Mo^ 1) being bonded to a polymolybdate cluster and excited via that cluster; the yellow PL was postulated to originate from a MOB 1 —Ar Van der Waals complex. At 10 K the "white" PL of the polymeric MOB 1 species showed a faint vibronic fine structure; the emission time constant was measured to be 5 ms. With the reduced compounds, only one PL was observed attributable to the monomeric MoX 1 species. Hence this species was concluded to be the only one not or not completely being reducible. 
  Reference    Z. Naturforsch. 42b, 756—763 (1987); eingegangen am 16. Januar 1987 
  Published    1987 
  Keywords    Luminescence, Surface Compounds, Molybdenum Compounds 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0756.pdf 
 Identifier    ZNB-1987-42b-0756 
 Volume    42 
5Author    F. Burak, J. Tyrzyk, Z. PolackiRequires cookie*
 Abstract    Time resolved em ission spectra and the luminescence decay of 2,5-diphenyloxasole in dioxane-water mixtures disclose an im portant influence o f water on the observed luminescence. We suppose that this is caused by structural changes of the solution connected with its water content. 
  Reference    Z. Naturforsch. 49a, 964 (1994); received July 16 1994 
  Published    1994 
  Keywords    Luminescence, Excimers, TRES, Em ission spectra, Solution structure 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0964.pdf 
 Identifier    ZNA-1994-49a-0964 
 Volume    49 
6Author    P. Kierzkowski, B. Pranszke, A. Kowalski, M. MenzingerRequires cookie*
 Title    Electronic Energy Partitioning in the Reactions of Metastable Mg*( 3 Pj) Atoms with F 2 , Cl 2 , Br 2 ,1 2 , IC1, IBr  
 Abstract    Chemiluminescent reactions of metastable Mg*(3 Pj) atoms with F 2 , Cl 2 , Br 2 , I 2 , IC1, IBr molecules were studied in a beam-gas experiment. For all homonuclear targets the MgX(A 2 FI -X 2 X +) emission was observed, but for IC1 and IBr reactants the Mgl(A-X) emission was absent and only MgCl(A-X) or MgBr(A-X) spectra were found. In addition, for the I 2 , IBr, IC1, Br 2 reactions, broad pseudocontinua extend from above 400 nm into the infrared. These pseudocontinua are ten-tatively attributed to the Mgl, MgBr (B' 2 Z + -X 2 Z +) transition. The total attenuation cross sections, chemiluminescence cross sections and quantum yields were measured. The quantum yields are all below 5%. The results are analyzed using information theory. The low yields for the Mg* + F 2 system are explained by a barrier in the entrance channel. For other reactions the low yields are most probably caused by predissociation of the MgX*(A 2 n) products. 
  Reference    Z. Naturforsch. 55a, 433—140 (2000); received November 26 1999 
  Published    2000 
  Keywords    Chemiluminescence, Energy Transfer, Atomic Collisions, Molecular Collisions, Luminescence 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0433.pdf 
 Identifier    ZNA-2000-55a-0433 
 Volume    55 
7Author    M. W. Eiser-, W. Allfahrer, G. G. Liem, AnnRequires cookie*
 Title    Luminescence of the Red Modification of Single-Crystal Pt(bpy)Cl2 (bpy: 2,2 -Bipyridine) Evidence for Strong Inter-Complex Coupling  
 Abstract    The polarized optical emission (energy, intensity, lifetime) o f the red modification o f single­ crystal Pt(bpy)Cl2 as a function o f temperature (1.9 < T < 298 K) and hom ogeneous magnetic fields (0 < H < 6 T), and the temperature dependence o f the polarized optical absorption are reported. Analysis o f the spectra indicates a strong inter-complex coupling giving rise to elec­ tronic band structures and self-trapped states. 
  Reference    Z. Naturforsch. 45b, 652 (1990); received December 1 1989 
  Published    1990 
  Keywords    Luminescence, Single-Crystal Pt(bpy)Cl2, Inter-Complex Coupling 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-0652.pdf 
 Identifier    ZNB-1990-45b-0652 
 Volume    45 
8Author    W. A. Prütz, S. VogelRequires cookie*
 Title    Specific Rate Constants of Hydroxyl Radical and Hydrated Electron Reactions Determined by the RCL Method  
 Abstract    Relative rate constants of OH radical and eaq~ reactions have been determined by comparing, under steady x-irradiation, the effect of various solutes upon the radiation-induced chemiluminescence (RCL) of aqueous dye (DH) solutions, [DH + -OH] + eaq --> DH* + OH -. The results abundantly confirm other published data. RCL changes upon addition of phosphates indicate prototropic reactions with the oxidized dye, D'-f^PO^ ^ DH-+ + HPO4 2-, promoting or inhibiting the formation of semioxidized dye (DH-+) as the most efficient RCL precursor. The RCL enhancement commonly observed upon addition of halides and pseudo halides is discussed at some length on the base of previous and present results in order to focus attention to the possible correlation between such RCL enhancement and the effect of halogen-sensitization in radiobiology. RCL results suggest that the halide transients formed from OH radicals, X -+ -OH X 1 -f OH -, are very powerful oxidizing agents reacting with aromatics by electron-abstraction rather than by addition or H-abstraction. The common application of I -and SCN -as competitors for the estimation of OH radical reactivities is being commented in the context. 
  Reference    (Z. Naturforsch. 31b, 1501—1510 [1976]; received July 12 1976) 
  Published    1976 
  Keywords    Hydrated Electron, Hydroxyl Radical, Luminescence, Radiation Chemistry, Rate Constants 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1501.pdf 
 Identifier    ZNB-1976-31b-1501 
 Volume    31 
9Author    Irina Petkova, ApostolosJ. Maroulisa, Constantina Hadjiantoniou-Maroulis3, Peter NikolovRequires cookie*
 Title    Electronic Spectral Investigations upon the Photochemical Transformations of Some Substituted l-(N,N-bisacyl)amino-4,5-diphenyl-l,2,3-triazoles  
 Abstract    The objective of this report is to investigate the steady state and dynamic photophysical and photochemical properties o f l-(N,N-bisacyl)amino-4,5-diphenyl-1,2,3-triazoles in solvents o f dif­ ferent polarity at room temperature and in frozen matrix at 77 K. On the basis o f the comparison of their UV absorption and luminescence spectra with those of 4,5-diphenyl-1,2,3-triazole and diben-zamide (model compounds), cleavage o f the N-N bond in the title compounds after irradiation with polychrome UV light is proved. 
  Reference    Z. Naturforsch. 56a, 452 (2001); received May 14 2001 
  Published    2001 
  Keywords    l-(N ,N-bisacyl)am ino-1,2,3-triazoles, Absorption, Luminescence, UV Irradiation, N-N Bond Cleavage 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0452.pdf 
 Identifier    ZNA-2001-56a-0452 
 Volume    56 
10Author    Yuejin Lia, Lianshan Zhangb, Ernst Bayerb, Dieter Oelkrugc, Ulrich WeseraRequires cookie*
 Title    Comparative Luminescence of Rat Liver Cu-thionein and Its Chemically Synthesized a-Domain  
 Abstract    A peptide corresponding to the a-dom ain o f rat liver m etallothionein-2 was chemically syn­ thesized employing the solid phase peptide synthesis technique. Its luminescence properties that depend on the coordinated Cu(I) have been studied using luminescence spectrometric titration in the presence o f Cu(I). Unlike the intact metallothionein which has been converted into the Cu species, the emission and excitation spectra o f the Cu-a-fragm ent showed a red shift by 20 nm and 65 nm, respectively, suggesting a more compact and stable luminophore in the a-dom ain. Saturation o f Cu(I) coordination was reached in the presence o f 6.5 mol eq Cu(I) when the a-fragment was used and 12 mol eq Cu(I) were specifically bound by the intact metallothionein. The emission bands were hom ogeneous and no decline o f the cluster struc­ ture was observed when excessive Cu(I) was added after saturation. A rearrangement o f the Cu-cluster in metallothionein during its formation seems to be plausible. 
  Reference    Z. Naturforsch. 45c, 1193—1196 (1990); received June 6/A ugust 21 1990 
  Published    1990 
  Keywords    a-Fragment o f M etallothionein, Luminescence, Cu-Binding, Solid Phase, Peptide Synthesis 
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 TEI-XML for    default:Reihe_C/45/ZNC-1990-45c-1193.pdf 
 Identifier    ZNC-1990-45c-1193 
 Volume    45