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  • 1
    Electronic Resource
    Electronic Resource
    The reaction N2++N2→N3++N from thermal to 25 eV (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 2149-2153 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The endothermic reaction N2++N2→N3++N has been investigated both experimentally and by ab initio calculations. Integral cross sections are presented as a function of collision energy. For excited N2+ ions the reaction onset shifts towards lower energies, indicating that the internal energy of the reactant ions promotes the reaction. Analysis of the energy dependence of the cross section does not allow an unequivocal determination of the reaction endothermicity. However, calculations of the ground doublet surface indicate that the minimum energy path from reactants to products proceeds through strongly bent geometries, with an endothermicity equivalent to the thermodynamic value of about 5 eV. For linear geometries an additional barrier of about 1 eV is found in the product channel. The structure of N4+ in its first excited quartet state has been also calculated by ab initio methods. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1336808
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Studies of C60-metal reactions in the laser-ablation plasma of C60/M2O3 (M=La, Y, Eu, Gd) (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 189-192 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reactions of excimer laser (XeCl, 308 nm) vaporized and excited fullerene C60 with La, Y, Eu, and Gd were carried out in mixtures of C60/La2O3, C60/Y2O3, C60/Eu2O3, and C60/Gd2O3. The reaction products M@xaC60, M@xaC60-2n and M@xaC60+2m (M=La, Y, Eu, and Gd) were identified by a reflectron type time-of-flight mass spectrometer (RTOFMS). The products were subjected to reactions with H2O, O2, and N2O in a pick-up source. The metallofullerenes were found to be nonreactive toward H2O, N2O, and O2. This gives support to the endohedral nature of the metallofullerenes. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469390
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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Resonant two-photon ionization spectra of the van der Waals complexes: C6H5X⋅⋅⋅N2 (X=F, Cl, Br) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 5305-5312 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The one-color resonant two-photon ionization technique is employed to study jet-cooled van der Waals (vdW) clusters of halobenzene and nitrogen through the S0→S1 transition around the 0¯00 band. The spectra obtained exhibit rich information about the clusters' intermolecular vdW vibrational modes and their solvent internal rotation. We have tentatively assigned all the observed spectral features to a single isomer of C6H5X⋅⋅⋅N2 (X=F, Cl, Br). The influence of X on the vdW vibrations and the internal rotation of N2 in the complex is investigated. The analysis of the influence of X on the 0¯00 spectral shift suggests that the change in vdW interaction energy upon electronic excitation is mainly due to the dispersion term. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472408
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  • 9
    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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  • 10
    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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