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  • 1
    Electronic Resource
    Electronic Resource
    Guided-ion beam investigations of the reactions CO++N2 and N2++CO (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 4132-4138 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have investigated seven different reaction channels for each of the two symmetric charge-state reactants CO+N2 and N2++CO. For all the 14 reactions we have measured the integral cross sections as a function of relative energy and determined the corresponding reaction enthalpies. We make use of these values to find the heats of formation of NCO, NCO+, CNN, and CNN+. Similar branching ratios are observed for both charge-state reactions. This gives some hints that all reactions proceed through the same intermediate N2CO+. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288176
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  • 2
    Electronic Resource
    Electronic Resource
    Guided ion beam investigation of the reaction CO++CO: C–O bond activation and C–C bond formation (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 8852-8856 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have investigated six different endothermic channels in the reaction of CO+ ions with neutral CO. For each ionic product we have measured the kinetic energy dependence of the integral cross section and inferred the neutral products by the reaction energetics. The onset of the process producing C+, O, and CO, has been identified by a feature of the integral cross section located at about 8.5 eV. Measurements of the product isotopic ratio suggest that C+ originates from both the CO+ ion and the neutral CO molecule. For the reaction channels producing C2++O2 and C2O++O, respectively, measurements of the reaction thresholds allow us to estimate the heats of formation of these two ionic products, ΔfH0(C2+)=19.8±0.2 eV and ΔfH0(C2O+)=14.7±0.2 eV. These values are in good agreement with recent independent estimations. Finally, we re-evaluated the dissociation energy of C2+(X 4Σg−), D0(C+–C)=6.2±0.2 eV. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480231
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  • 3
    Electronic Resource
    Electronic Resource
    Dehydrogenation and physisorption of saturated hydrocarbons (n-butane and isobutane) on Nbx+ (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 8935-8939 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Niobium cluster cations, Nbx+, are produced from a laser vaporization/supersonic expansion cluster ion source, and their reactivities are studied using a fast-flow reactor. The reaction patterns of n-butane and isobutane are found to be quite similar. In general, the relative reactivity of the cluster cations shows a decreasing trend with increasing cluster size (x=1–9). Dehydrogenation products from the butane molecules are observed within the small cluster size range (x=1–6). The degree of dehydrogenation increases with cluster size (x=1–6); but right after x=7, no dehydrogenation is observed and only molecular adsorption takes place. The product distribution for isobutane is found to be more scattered to channels of different extent of dehydrogenation than that for n-butane. The results are explained on the basis of the prompt insertion and the lowering of the activation barrier by the charge-induced polarization. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477578
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  • 4
    Electronic Resource
    Electronic Resource
    Dehydration Reactions of Metal Cations (Fe+ and LaO+) with Methanol Clusters (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 12099-12102 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100032a008
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  • 5
    Electronic Resource
    Electronic Resource
    Production of ArN+ ions in the reactions Ar++N2 and N2++Ar (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 4276-4279 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have studied the production of ArN+ starting from the two symmetric charge-state reactants Ar++N2 and N2++Ar. For both reactions we measured the total cross sections as a function of the relative energy, in the energy range from 5 to 45 eV. Estimates of the reaction thresholds and symmetry considerations suggest that the reaction Ar++N2 produces ArN+ essentially in its first excited state A 3Π, while the reaction N2++Ar produces ground state ArN+ ions. This fact explains the discrepancies between different estimates of the dissociation energy of ArN+ obtained in previous studies. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478311
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  • 6
    Electronic Resource
    Electronic Resource
    Reactions of C+(2Pu) with CO(1Σ+) from thermal energies to 30 eV (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 1330-1334 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The endoergic reactions of C+(2Pu) with CO(1Σ+) producing CO++C, C2++O, and O++C2 have been studied in a guided-ion beam apparatus. For each reaction channel, we have measured the kinetic energy dependence of the integral cross section and the reaction threshold. Analysis of the reaction cross sections yield the heats of formation ΔfH0(C2+)=19.79±0.16 and ΔfH0(C2)=8.37±0.16 eV. In addition the dissociation energy of C2 is estimated to be D0(C–C)=6.37±0.16 eV. A simple state correlation diagram is used to rationalize experimental observations and to discuss reaction dynamics. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480686
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  • 7
    Electronic Resource
    Electronic Resource
    Bond-forming reactions of molecular dications with rare gas atoms: Production of ArC2+ in the reaction CO2++Ar (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 4648-4651 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Integral cross sections for the bond-forming reaction CO2++Ar→ArC2++O have been measured as a function of collision energy in a guided-ion beam mass spectrometer. The energy dependence is consistent with an endoergic reaction. Since the title reaction is in competition with several charge-transfer processes, the cross section at the maximum is only 0.023 Å2 at a collision energy of about 3 eV. Simple kinematics considerations suggest that the falloff of the cross section at higher energies might be due to the vibrational predissociation of ArC2+. State correlation diagrams are used for discussing the reaction mechanism. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481020
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  • 8
    Electronic Resource
    Electronic Resource
    Resonant two-photon ionization and fluorescence excitation studies of o, m-difluorobenzene(centered ellipsis)Ar. Spectral shifts and intermolecular vibrations (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 12-19 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Resonant two-photon ionization (R2PI) spectra of the van der Waals (vdW) complexes 1,2-difluorobenzene(centered ellipsis)Ar (o-DFB(centered ellipsis)Ar) and 1,3-difluorobenzene(centered ellipsis)Ar (m-DFB(centered ellipsis)Ar) through the S1←S0 transition revealed a number of bands near the origin 000. All these bands are assigned to the low-frequency intermolecular vibrations. Quantum calculations using the method of linear-combination of three-dimensional harmonic oscillator products (LCHOP) were carried out to derive the intermolecular vibrational energy levels. Detailed assignments of the intermolecular vibrational modes are accomplished with the help of the quantum calculations and the comparison with the available data on related systems, e.g., C6H6(centered ellipsis)Ar and p-DFB(centered ellipsis)Ar. Fluorescence excitation method was used to derive the spectral shifts of intramolecular bands (S1←S0) of o, m-DFB upon complexation with Ar. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475390
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  • 9
    Electronic Resource
    Electronic Resource
    Two-photon ionization studies of binary aromatic van der Waals clusters: Benzene...chlorobenzene and (chlorobenzene)2 (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 8843-8851 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Jet-cooled van der Waals dimers of benzene (B) and chlorobenzene (BCl) were studied by one-color resonant two-photon ionization through the S0→S1 transition of the chlorobenzene. The spectra of BCl...B and (BCl)2 in the 0–0 band both show two main features with different spectral shifts. These two main features are attributed to two different geometries: perpendicular T-shaped geometry and parallel displaced geometry. This assignment is supported by the relative intensity dependence on the internal temperature and our ab initio calculations at the MP2 level. The binding energies of BCl...B and (BCl)2 were measured near the two-photon ionization dissociation threshold in a reflectron time-of-flight mass spectrometer (RTOF/MS). Our estimated binding energies of BCl...B and BCl...BCl are 0.14±0.01 eV and 0.15±0.01 eV, respectively, consistent with their increasing dipole moment and polarizability in that order. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471618
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  • 10
    Electronic Resource
    Electronic Resource
    Generation of fullerenes and metal–carbon clusters in a pulsed arc cluster ion source (PACIS) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 6577-6581 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By combining a pulsed arc cluster ion source with a reflection time-of-flight mass spectrometer, we have produced and detected in situ fullerene cations as well as vanadium–carbon cluster cations. The cluster arrival time distributions favor the "fullerene road'' mechanism for fullerene growth. The formation of fullerene cations was found to be strongly dependent on the discharge and nozzle conditions. Fullerene C+60/C+70 were preferentially produced by optimizing these conditions. Vanadium–carbon cluster cations were produced and detected by using a composite electrode (V2O5/graphite). While the metallocarbohedrene V8C+12 could be produced with a reasonable intensity, it was not dominant under our experimental conditions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471377
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