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  • American Institute of Physics (AIP)  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The hydrogen atom channel in the photodissociation of ethylene (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6398-6402 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of ethylene at 193 nm is studied by laser induced fluorescence of the hydrogen atom product. The quantum yield for producing deuterium atoms from C2D4 is 0.19±0.04. Their average translational energy is 7.3±1.3 and 15.1±1.4 kcal/mol at 193 and 157 nm, respectively. Considerable evidence, both experimental and theoretical, shows that dissociation takes place from a hot internally equilibrated ground state molecule. A remarkable isotope effect is found. The ratio of H atoms to D atoms released from CH2CD2 is 2.2±0.2, whereas that from t-CHDCHD is 1.2±0.1. An RRKM model explains these ratios. For CH2CD2 the vibrational frequencies of the transition state for releasing H atoms are quite different from those for the release of D atoms. In t-CHDCHD, the transition state frequencies are nearly the same; there is a cancellation between differing zero point energies and moments of inertia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458956
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The isotope exchange reaction of fast hydrogen atoms with deuterated alkynes and alkenes (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 206-212 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The exchange reaction H(1 eV)+RD→RH+D, where RD was deuterated acetylene, methylacetylene, ethylene, and propylene was studied by laser induced fluorescence detection of the hydrogen and deuterium atoms. The reaction cross sections were 1.69±0.22, 0.50±0.15, 1.85±0.20, and 1.10±0.14 A(ring)2, respectively. The fraction of the incident relative kinetic energy released as translation was 0.42, 0.34, 0.40, and 0.34. That the addition of a methyl group only slightly reduces the energy released as translation is regarded as proof that the reaction at this energy does not involve a long lived intermediate complex, but is a direct localized displacement. Further confirmation comes from the observation that the velocity of the D atom product of H+C2D2 is correlated with the velocity of the H atom reactant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458464
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Energy distribution of the CN products of the H+HCN, H+ClCN, and F+HCN reactions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7096-7102 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Three reactions of the type X+YCN→XY+CN (X, Y=H, H; H, Cl; F, H) were studied by probing the internal state distribution of the CN product. The fraction of the available energy released as CN rotation is very small consistent with theoretical predictions that these reactions are collinear abstractions. At higher incident kinetic energies of the X atom a larger fraction of the available energy is released into rotation, suggesting that the reactive collision can take place at larger angles of attack. In the reverse reaction CN+HD→HCN(DCN) +D(H) using rapidly rotating CN as a reactant the [H]/[D] ratio is 1.4±0.1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456238
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