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  • 1
    Electronic Resource
    Electronic Resource
    Chemiluminescent reaction of tellurium with fluorine: The A 2Πi–X 2Πi and B 2Σ+–X2Πi transitions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5007-5012 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Te reacts with fluorine to give a strong chemiluminescence between 3800 and 8700 A(ring). The emission spectrum contains both 2Σ+–2Πi and 2Πi–2Πi systems. TeF emission bands are of the Hund's type (a) without spin forbidden intermultiplet crossing. Spin orbit coupling of the X 2Πi state is −497 cm−1 as determined from the 2Σ+–2Πi transition. Vibrational constants are reported for all states and compare favorably with those obtained from theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449766
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  • 2
    Electronic Resource
    Electronic Resource
    Chemiluminescent reaction of selenium with fluorine: Assignment of the SeF A 2Π3/2 state (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4544-4553 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Selenium reacts with fluorine with a weak visible chemiluminescence between 3800 and 8900 A(ring). Identical spectra are obtained regardless of whether the source of selenium is the elemental vapor or hydrogen selenide. By analogy with C10, TeF, and reevaluated SF absorption data, the SeF band system is assigned to transitions between inverted 2Π states. The spectroscopic constants for the A 2Π3/2 to X 2Π3/2 system are: Te=14 680.4 cm−1, ω‘e =688.8 cm−1, ωex‘e =1.84 cm−1, ω'e =444.1 cm−1, and ωexe =2.93 cm−1. The weak 2Π1/2 to 2Π1/2 subband is described by the constants: Te =15 025.4 cm−1, ω‘e =683.0 cm−1, ωex‘e =2.11 cm−1, ω'e =436.9 cm−1, and ωexe =1.20 cm−1. Laser excitation spectra were recorded for the SeF chemiluminescence flame. The SeF fluorescence between 4200 and 5200 A(ring) is rapidly quenched with increasing total pressure. A Stern–Volmer analysis gave a zero pressure lifetime of 12.8±3.9 μs. The measured quenching rate of 2.5×106 s−1 Torr−1 is nearly gas kinetic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449024
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An EPR study of the thermal decomposition of molten 2,4,6-trinitrotoluene and its isotopic analogs (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 762-767 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electron paramagnetic resonance spectroscopy has been used to probe the decomposition pathway of neat molten 2,4,6-trinitrotoluene (TNT). The analogs of TNT labelled in the 2-, 2,6-, 4- and 2,4,6-positions with 15N, and labelled in the α-, 3,5- and α,3,5-position with 2H have been studied, and their spectra recorded at 240°C. The results indicate that the earliest observable radical produces a spectrum resulting from coupling with a para-N (aN = 10.8G), five equivalent hydrogens (aH = 2.7G) and two benzylic hydrogens (aH = 10.7G).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240906
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  • 4
    Electronic Resource
    Electronic Resource
    Carbon-13 NMR relaxation studies of gluconate and manganese - gluconate interactions (1988)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 26 (1988), S. 591-594 
    Details
    ISSN: 0749-1581
    Keywords: 13C NMR Relaxation ; rates NOE ; factors Activation ; energies Chemical shifts ; Gluconate Manganese-gluconate ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effect of temperature on the spin-lattice (R1) and spin-spin (R2) 13C relaxation rates of gluconate and manganese (II)-gluconate interactions was determined in D2O. An R2 vs T-1 minimum was observed for gluconate similar to that observed in solid-liquid phase transitions. Nuclear Overhauser enhancement factors indicated predominately dipolar relaxation mechanisms for all atoms except the carbonyl carbon. Activation energies and chemical shifts indicated a molecular reorientation involving the carbonyl carbon which resulted in changes in solvation effects. Addition of manganese(II) to gluconate in D2O resulted in an observed minimum in the R1 vs T-1 plots for all carbon atoms except the carbonyl species. The activation energies further supported the concept of changes in solvent-manganese-gluconate interactions produced by variations in intramolecular structure.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260260711
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    Paper (German National Licenses)
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