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  • American Institute of Physics (AIP)  (3)
  • International Union of Crystallography (IUC)
  • Springer Nature
  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Quenching rate constants of excited halogen atoms in quartet states (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4876-4883 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Excited halogen atoms in quartet spin states F*(2p43s, 4P5/2), Cl*(3p44s, 4P5/2), and Br*(4p45s, 4P5/2) were produced from helium sensitized radiation chemical decomposition of SF6, CF3Cl, CF3Br, and CF2Br2. Quenching rate constants of these excited halogen atoms by simple gas molecules such as O2, N2, H2, CO, CO2, NO, NO2, N2O, CH4, C2H6, and Xe including parent molecules were determined from absorption decay curves at 685.8 nm for F*, 837.5 nm for Cl*, and 827.4 nm for Br*. The optical densities were assumed to be proportional to (number of excited atoms per one cubic centimeter)0.9. The quenching rate constants obtained here were compared to those reported of metastable rare-gas atoms and an excited oxygen atom O*(2p33s, 5S2), and further discussed in terms of several theoretical kinetic models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467207
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Branching ratios and bond dissociation energies from the excimer laser photolysis of group 6 metal carbonyls (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 5471-5480 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photolysis of the group 6 (Cr, Mo, W) metal carbonyls in the gas phase, at excimer laser wavelengths, may lead to more than one primary product. Branching ratios between these products have been measured as a function of photolysis wavelength, buffer gas pressure, and temperature using time-resolved infrared spectroscopy. The results are modeled using a sequential dissociation mechanism in which branching ratios are determined by competition between unimolecular dissociation and collisional relaxation. The sensitivity of the results to thermochemical input parameters and assumptions concerning energy disposal mechanisms is discussed. Under qualified assumptions the branching ratio measurements provide estimates for CO bond dissociation energies for coordinatively unsaturated metal carbonyls. For Mo and W the individual bond dissociation energies are close to the average values but for Cr the first three ligands coordinated are significantly less strongly bound than the last three. This finding is discussed in terms of recent ab initio calculations on bonding in metal carbonyls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460482
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reactions of highly excited oxygen atoms O(2p33s,5S) with simple gas molecules (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 9094-9098 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electron pulse irradiation of 10 atm He containing one of CO, CO2, NO, NO2, or N2O at small amounts produced highly excited oxygen atoms O(2p33s,5S), which subsequently disappeared by their reactions with parent molecules. The rate constants have been determined from the absorption decay curves at 777.3 nm O(2p33p,5P)←O(2p33s,5S). The rate constants for the reactions of O(2p33s,5S) with Xe, H2, N2, CH4, and C2H6 could be determined in the irradiation of mixtures of He, O2, and these gases with electron pulses. The upper limit of a quenching rate constant was estimated for Kr. The observed rate constants showed good correlation with the quenching rate constants of Kr(4p55s,3P2) or Xe(5p56s,3P2) by the same gas molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463336
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