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  • 1985-1989  (26)
  • 1980-1984  (4)
  • 1970-1974  (5)
  • 1955-1959  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Necessary Lies, Hidden Truths: Cuba in the 1960 Campaign (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Diplomatic history 8 (1984), S. 0 
    Details
    ISSN: 1467-7709
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: History , Political Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-7709.1984.tb00400.x
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of the oxidative addition of triethylsilane to photochemically generated (.eta.5-C5Cl5)Mn(CO)2 (1989)
    s.l. : American Chemical Society
    Organometallics 8 (1989), S. 1063-1066 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00106a030
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  • 3
    Electronic Resource
    Electronic Resource
    Spin-orbit state-selected reactions of Kr+(2P3/2 and 2P1/2) with H2, D2, and HD from thermal energies to 20 eV c.m. (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 6380-6395 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spin-orbit state-selected reactions of Kr+(2PJ), J=3/2 and J=1/2, with isotopic molecular hydrogen (H2, D2, and HD) to form KrH+ and KrD+ are investigated using guided ion beam techniques. Reaction cross sections for each spin-orbit state are measured as a function of the relative translational energy of the reactants from near thermal energies up to 20 eV c.m. At low energies, the cross sections for reaction with H2 and D2 are each about 2.6 times larger for the 2P3/2 ground spin-orbit state of krypton ion than for the 2P1/2 excited state. For the HD reaction, the 2P3/2 reactivity is enhanced by a factor of about 4.2. A higher-energy process, which exhibits an apparent activation energy of about 1 eV, is present only for the 2P3/2 spin-orbit state. The Kr+(2P3/2) spin-orbit state exhibits a strong intermolecular isotope effect, showing the unusual dependence σ(HD)〉σ(H2)〉σ(D2) for the total reaction cross sections at low energies. Cross sections for the Kr+(2P1/2) state show a much smaller dependence on the hydrogen isotope. The intramolecular isotope effect for the individual KrH+ and KrD+ channels in the reaction with HD shows several reversals over the energy range studied. These results are discussed in terms of the potential energy surfaces of the krypton–hydrogen system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451469
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  • 4
    Electronic Resource
    Electronic Resource
    C+(2P)+H2(D2,HD)→CH+(CD+)+H(D). I. Reaction cross sections and kinetic isotope effects from threshold to 15 eV c.m. (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 6738-6749 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Total cross sections for the reactions of carbon(1+) ions with isotopic molecular hydrogen (H2, D2, and HD) to form methyliumylidene (CH+ and CD+) have been measured using guided ion beam techniques. Cross sections are reported as a function of the translational energy of the reactants from the reaction threshold up to 15 eV c.m. The true cross sections are shown to rise sharply from thresholds given by the thermochemical endothermicities. Inter- and intramolecular isotope effects in the threshold region can be attributed to the different endothermicities due to vibrational zero-point energies. At higher energies, an unexpected intermolecular isotope effect is found. Thermal reaction rates (300 K) derived from the data are 1.2×10−16 for H2, 2.3×10−17 for D2, and 1.2×10−16 for HD (17% CH+, 83% CD+), all in units of cm3 s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450677
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  • 5
    Electronic Resource
    Electronic Resource
    C+(2P)+H2(D2,HD)→CH+(CD+)+H(D). II. Statistical phase space theory (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 6750-6760 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Statistical phase space theory is applied to the reactions of carbon(1+)ions with isotopic molecular hydrogen (H2, D2, and HD) to form methyliumylidene (CH+ and CD+). Reaction cross sections and isotope effects as a function of kinetic energy are compared to recent experimental results. The important features of the potential energy surfaces for the C+(2P)+H system are reviewed. The treatment of multiple electronic potential energy surfaces and excited state product channels in phase space theory is discussed. Phase space theory accurately reproduces the relative behavior of the experimental cross sections in the threshold region. Also, the cross section magnitude is reproduced if only those potential energy surfaces without energy barriers in the entrance channel are included in the phase space model. Phase space theory fails, however, to predict quantitatively the kinetic isotope effects or the shape of the cross section at higher energies where excited state CH+ production may be important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450678
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  • 6
    Electronic Resource
    Electronic Resource
    Energy dependence, kinetic isotope effects, and thermochemistry of the nearly thermoneutral reactions N+(3P)+H2(HD,D2)→NH+(ND+)+H(D) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2659-2673 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reactions of N+(3P) ions with H2, HD, D2 are examined using guided ion beam tandem mass spectroscopy. Absolute reaction cross sections are measured from near thermal energies to 30 eV relative energy. The low energy cross section behavior is analyzed using empirical threshold models and phase space theory. The results are compared to other recent studies of the N++H2 system. The reaction endothermicity for N+(3P)+H2→NH++H, ΔH(open circle)0 =0.033±0.024 eV (0.76±0.55 kcal/mol), and the bond energy of NH+, D(open circle)0(N–H+) =3.51±0.03 eV (80.9±0.6 kcal/mol), are derived from the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452068
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  • 7
    Electronic Resource
    Electronic Resource
    Translational energy dependence of O+(4S)+N2→NO++N from thermal energies to 30 eV c.m. (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1944-1953 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Guided ion beam mass spectrometry is used to examine the kinetic energy dependence of the reaction of ground state atomic oxygen ion with molecular nitrogen. An O+(4S) source which produces less than 0.06% excited states is described. Cross sections for the NO++N product channel decrease with increasing energy below 0.25 eV but increase with energy at higher energies. Analysis of the region above 0.25 eV finds an effective barrier of 0.33±0.08 eV which previous theoretical work suggests is on the N2O+(1 4A‘) hypersurface. Below this barrier, ground state products can only be formed via a spin-forbidden surface transition. The magnitude and energy dependence of the probability for this transition are in reasonable agreement with a Landau–Zener formalism. These results are compared to previous ion beam, flowing afterglow (FA), and flow/drift tube (FD) studies. Apparent disagreement between the present data and previous FA and FD measurement is shown to be caused primarily by differences in the ion energy distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452144
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrogen atom transfer reactions of He+ and Ne+ with H2, D2, and HD (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 6240-6250 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hydrogen atom transfer reactions of helium(1+) and neon(1+) ions with isotopic molecular hydrogen (H2, D2, and HD) are investigated using guided ion beam techniques. These reactions are exothermic, but are known to be extremely slow at thermal energies. The cross sections for formation of HeH+ (HeD+) and NeH+ (NeD+) exhibit thresholds at high relative translational energies, 8 to 12 eV c.m. Unusual isotope effects are observed in the reaction with HD. The deuteride product is formed exclusively near threshold, while the hydride product predominates at higher energies. Reaction mechanisms involving Rydberg excited states of HeH+2 and NeH+2 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452461
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  • 9
    Electronic Resource
    Electronic Resource
    Translational energy dependence of Ar++XY→ArX++Y (XY=H2,D2,HD) from thermal to 30 eV c.m. (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 166-189 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Cross sections for the reactions of Ar+ with H2, D2, and HD to form ArH+ and ArD+ are measured using a new guided ion beam tandem mass spectrometer which affords an experimental energy range from 0.05 to 500 eV laboratory. The apparatus and experimental techniques are described in detail. Cross sections for H2 and D2 are found to be nearly identical over this entire energy range when compared at the same barycentric energy. The total HD cross section is the same as H2 and D2 at low energies, but differs significantly above 4 eV c.m., where product dissociation becomes important. The intramolecular isotope effect for reaction with HD exhibits a reversal at low energy, favoring the deuteride product below ∼0.14 eV c.m., and surprising nonmonotonic behavior at energies above 5 eV c.m. In all these systems, a new feature at higher energies is observed. This is interpreted as the onset of a product channel having an energy barrier of 8±1 eV. The room temperature rate constant derived from the data for the reaction with H2 is (9.5±2)×10−10 cm3 s−1, in good agreement with the literature. Analysis of the data indicates an activation energy of between 2 and 15 meV at room temperature. The results are compared to previous experimental determinations and to theoretical reaction models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449799
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  • 10
    Electronic Resource
    Electronic Resource
    NH2 electron affinity (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2762-2763 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 363.8 nm (3.408 eV) photoelectron spectrum of the NH2 (X˜ 2B1)+e−←NH−2(X˜ 1A1) transition of the amide anion is reported. The electron affinity of amidogen is found to be EA(NH2) =0.771 ±0.005 eV. P, Q, and R rotational branches are observed in the spectrum; a simple model which accounts for the band structure is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456994
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