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  • 1995-1999
  • 1985-1989  (3)
  • 1985  (3)
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Material
Years
  • 1995-1999
  • 1985-1989  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    A state-to-state study of the symmetric charge transfer reaction Ar+(2P3/2,1/2)+Ar(1S0) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 5489-5498 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The relative state-to-state total charge transfer cross sections, σ3/2→3/2, σ3/2→1/2, σ1/2→1/2, and σ1/2→3/2, for the reactions Ar+(2P3/2)+Ar(1S0) → Ar(1S0)+Ar+(2P3/2) → Ar(1S0)+Ar+(2P1/2), Ar+(2P1/2)+Ar(1S0) → Ar(1S0)+Ar+(2P1/2) → Ar(1S0)+Ar+(2P3/2), respectively, at the laboratory collision energy range of 1–4000 eV, have been determined using the newly constructed crossed ion–neutral beamphotoionization apparatus. This apparatus is equipped with a high resolution photoionization ion source for reactant state selections and a charge transfer detector for product state identifications. The measured profile of the kinetic energy dependence for the probability for 2P3/2→2P1/2 fine-structure transitions in Ar+(2P3/2)+Ar(1S0) charge transfer collisions [σ3/2→1/2/(σ3/2→3/2+σ3/2→1/2)] is in general agreement with the theoretical prediction of Johnson. However, the theoretical probabilities are approximately 40% greater than those observed in this experiment. The total charge transfer cross section for Ar+(2P3/2)+Ar(1S0)[σ3/2→3/2+σ3/2→1/2] were found to be slightly higher than that for Ar+(2P1/2)+Ar(1S0)[σ1/2→1/2+σ1/2→3/2]. Furthermore, the experimental values for (σ1/2→1/2+σ1/2→3/2)/(σ3/2→3/2+σ3/2→1/2) indicate that the difference in the total charge transfer cross sections for Ar+(2P1/2)+Ar(1S0) and Ar+(2P3/2)+Ar(1S0) diminishes at both low and high collision energies, in accordance with the theoretical expectations. Taking into account the experimental uncertainties, the experimental results are also consistent with detailed balance which requires the value for σ1/2→3/2 to be twice that for σ3/2→1/2 at collisional energies substantially higher than the spin-orbit splitting of Ar+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448584
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A study of the unimolecular decompositions of the (C3H6)+2 and (c-C3H6)+2 complexes (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 2803-2812 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The major product channels identified in the unimolecular decompositions of C3H+6⋅C3H6 and c-C3H+6⋅c-C3H6 in the total energy [neutral (C3H6)2 or (c-C3H6)2 heat of formation plus excitation energy] range of ∼230–450 kcal/mol are C3H+7+C3H5, C4H+7+C2H5, C4H+8+C2H4, and C5H+9+CH3. The measured appearance energy for C4H+7(9.54±0.04 eV) from (C3H6)2 is equal to the thermochemical threshold for the formation of C4H+7+C2H5 from (C3H6)2, indicating that the exit potential energy barrier for the ion–molecule reaction C3H+6+C3H6→C4H+7+C2H5 is negligible. There is evidence that the formations of C4H+7+C2H4+H from (C3H6)+2 and (c-C3H6)+2 also proceed with high probabilities when they are energetically allowed. The variations of the relative abundances for C4H+7,C4H+8, and C5H+9 from (C3H6)+2 and (c-C3H6)+2 as a function of ionizing photon energy are in qualitative agreement, suggesting that (C3H6)+2 and (c-C3H6)+2 rearrange to similar C6H+12 isomers prior to fragmentation. The fact that C6H+11 is found to be a primary ion from the unimolecular decomposition of (c-C3H6)+2 but not (C3H6)+2 supports the conclusion that the distribution of C6H+12 collision complexes involved in the C3H+6+C3H6 reactions is different from that in the cyclopropane ion–molecule reactions. Using the ionization energies (IE) of (C3H6)2(9.33±0.04 eV) and (c-C3H6)2(9.61±0.04 eV) determined in this study, the calculation of the bond dissociation energies for C3H+6⋅C3H6 and c-C3H+6⋅c-C3H6 gives 0.43 and 0.14 eV, respectively. The measured IE of C3H6 is 9.738±0.003 eV and that of c-C3H6 is 9.721±0.011 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449229
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A study of the unimolecular decomposition of the (C2H4)+3 complex (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 2813-2817 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The energetics and dissociation dynamics of the (C2H4)+3 complexes have been studied by photoionization of neutral van der Waals ethylene trimers. The major product channels identified in the unimolecular decomposition of (C2H4)+3 in the total energy [neutral (C2H4)3 heat of formation plus excitation energy] range of ∼260–336 kcal/mol are C3H+6 +C3H6, C3H+7 +C3H5, C4H+7 +C2H5 (or C2H4+H), C4H+8 [or (C2H4)+2 ]+C2H4, C5H+9 +CH3, and C6H+11+H. The fact that these product channels are similar to those observed in the unimolecular decompositions of (C3H6)+2 and (c-C3H6)+2 is consistent with the interpretation that the (C2H4)+3 , (C3H6)+2, and (c-C3H6)+2 loose complexes rearrange to similar stable C6H+12 ions prior to fragmenting. The ionization energies (IE) of (C2H3)3 and (C2H4)4 are determined to be 9.465±0.036 (1310±5 A(ring)) and 9.287±0.034 eV (1335±5 A(ring)), respectively. Using the known IE's of (C2H4)n, n=2, 3, and 4, and the estimated binding energies of (C2H4)2 ⋅ C2H4 and (C2H4)3 ⋅ C2H4, the bond dissociation energies for (C2H4)+2 ⋅ C2H4 and (C2H4)+3 ⋅ C2H4 are deduced to be 9.2±1 and 4.6±1 kcal/mol, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449230
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    Paper (German National Licenses)
    Fulltext
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