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  • 1
    Electronic Resource
    Electronic Resource
    A crossed-beam study of the state-resolved integral cross sections for the inelastic scattering of OH(X 2Π) with CO and N2 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6508-6518 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: State-resolved cross sections for the inelastic scattering of OH(X 2Π) with CO and N2 have been measured in a crossed molecular beam apparatus over the energy range from 0.5 to 5.5 kcal mol−1. The magnitude and shape of the excitation functions for the same OH final states were virtually independent of the two targets except near threshold. Both spin–orbit conserving and spin–orbit changing transitions have been investigated. Cross sections for spin–orbit changing transitions of large ΔN were approximately the same magnitude as those for spin–orbit conserving transitions. For small ΔN, however, the spin–orbit conserving transitions became more favorable. The Λ-doublet ratio, Π(A')/Π(A‘), in the Π3/2 (F1) manifold differed from unity only for the N2 target for which the ratio became increasingly larger than unity as N' increased. The observed fine-structure effects were nearly the same as those from the corresponding (reverse) reactive collisions, and a close connection between the inelastic and reactive events has been conjectured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460279
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  • 2
    Electronic Resource
    Electronic Resource
    Fine-structure selectivity in polyatomic reaction products: CN(X 2Σ+,v=0,N=0,1)+O2→NCO(X˜ 2Π3/2, 0010,J,e/f)+O (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 1478-1479 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction CN+O2→NCO+O has been investigated in a crossed-molecular beam experiment at a collision energy of 0.76 kcal/mole. Internal state distributions of the ground state NCO(X˜ 2Π3/2, 0010,J,e/f) products have been measured by laser-induced fluorescence. The rotational excitation is small. There is an observed preference in the population of the K doublet fine-structure states, 1f〉1e, and this preference is even stronger for low J states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459160
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum mechanical calculations on the Ar++N2 charge transfer reaction (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1686-1693 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Calculations of cross sections for the charge transfer reaction Ar+(2P3/2)+N2(v=0, j) →Ar+N+2(v'=1, j') are reported for thermal collision energies. A three-dimensional quantum-mechanical method is used in which separate rotational close-coupling calculations are performed for the Ar++N2(v=0)→Ar+N+2(v'=0) and Ar++N2(v=1) →Ar+N+2 (v'=1) channels, and the cross sections for the v=0→v'=1 channel are computed using a coupled channel-distorted wave Born approximation. Potential energy surfaces and couplings are taken from ab initio data. The predicted rotational product distributions for N+2 (v'=1, j') agree fairly well with those measured in a molecular beam laser-induced fluorescence experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456061
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  • 4
    Electronic Resource
    Electronic Resource
    A rotationally resolved LIF study of the N+2 products of the thermal energy Penning ionization reaction: Ne*(3P2)+N2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5041-5043 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Multiple temperature rotational distributions are observed in the N+2 products of the Penning ionization of N2 by Ne*(3P2). The rotational distributions for N=2–21 are well fit by a two-component Boltzmann distribution having a low temperature of 50 K±10 K and a high temperature ranging from 220 to 490 K±50 K. The relative contribution of each component varies smoothly with vibrational level from 62% Tlow:38% Thigh for v=0 to 43% Tlow:57% Thigh for v=4(±5%). We interpret the observed multiple rotational distributions as evidence for exit channel effects arising from details of the impulsive interaction in the electron transfer process. Since the overall degree of rotational excitation is small, observation of the multiple distributions requires suppression of the reactant initial rotation by using a supersonic molecular beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452822
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  • 5
    Electronic Resource
    Electronic Resource
    A laser-induced fluorescence study of product rotational state distributions in the charge transfer reaction: Ar+(2P3/2)+N2→Ar+N+2 (X) at 0.28 and 0.40 eV (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1677-1685 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The nascent rotational state distributions of N+2 produced in the charge transfer reaction of Ar+ (2 P3/2 ) with N2 at 0.28 and 0.40 eV are remeasured by laser-induced fluorescence. A supersonic expansion is used to reduce the initial rotational angular momentum of the N2 . The N+2 product rotational distributions, in both v‘=0 and v‘=1, have low and high energy components. For ease of reference, we describe each distribution as a summation of two Boltzmann distributions. At a relative collision energy of 0.28 eV, the Boltzmann temperatures are 100±20 K and 745±120 K for N+2 (v‘=0) and 80±10 K and 680±30 K for N+2 (v‘=1). Adiabatic potential energy curves for the lowest vibronic states are calculated and a simple curve hopping model is presented. Applying this model to the production of N+2 (v‘=1), for example, those reactants that charge transfer on the outgoing leg of a reactive trajectory interact with a deep potential well in the entrance channel for collinear geometry. We postulate that rotationally excited products result. In comparison, reactants that charge transfer on the ingoing leg (or in perpendicular geometry) do not sample the collinear potential well and the resulting products are less rotationally excited.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456673
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    Paper (German National Licenses)
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