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  • 1
    Electronic Resource
    Electronic Resource
    State-Specific Reactions of Fe+(a6D,a4F) with D2O and Reactions of FeO+ with D2 (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 6522-6529 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100077a017
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  • 2
    Electronic Resource
    Electronic Resource
    Kinetics of Ti(a3F, a5F) and V(a4F, a6D) Depletion by NH3 and H2S (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 13286-13293 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100101a030
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  • 3
    Electronic Resource
    Electronic Resource
    High-resolution ion mobility measurements (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 1122-1129 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Gas phase ion mobility measurements can resolve structural isomers for polyatomic ions and provide information about their geometries. A new experimental apparatus for performing high-resolution ion mobility measurements is described. The apparatus consists of a pulsed laser vaporization/desorption source coupled through an ion gate to a 63-cm-long drift tube. The ion gate is a critical component that prevents the diffusion of neutral species from the source into the drift tube. Ions travel along the drift tube under the influence of a uniform electric field. At the end of the drift tube some of the ions exit through a small aperture. They are focused into a quadrupole mass spectrometer, where they are mass analyzed, and then detected by an off-axis collision dynode and by dual microchannel plates. The apparatus is operated with a drift voltage of up to 14 000 V and a helium buffer gas pressure of around 500 Torr. The resolving power for ion mobility measurements is over an order of magnitude higher than has been achieved using conventional injected-ion drift tube techniques. Examples of the application of the new apparatus in resolving isomers of laser desorbed metallofullerenes, in studying silicon clusters generated by laser vaporization, and in following the isomerization of small nanocrystalline (NaCl)nCl− clusters as a function of temperature, are presented. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147873
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  • 4
    Electronic Resource
    Electronic Resource
    Gas-phase thermochemistry of VH and CrH (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 4929-4936 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The homolytic bond dissociation energies of the transition-metal neutral hydrides, Do(M–H) (M=V, Cr), are experimentally determined by using guided ion beam tandem mass spectrometry to measure the kinetic energy dependence of the endothermic hydride abstraction reactions of M+ with mono-, di-, and trimethylamine. From the thresholds of these reactions, we derive the 0 K values of Do(V–H)=2.13±0.07 eV and Do(Cr–H)=1.93±0.07 eV. This thermochemistry is compared with theoretical values and previous experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464948
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  • 5
    Electronic Resource
    Electronic Resource
    Direct determination of the adiabatic ionization energy of NO2 as measured by guided ion-beam mass spectrometry (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2451-2458 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The adiabatic ionization energy (IE) of NO2 is measured to be 9.60±0.03 eV by studying the charge-transfer reactions of Zn+, NO+, and CH3I+ with NO2 and those of NO+2 with α,α,α-trifluorotoluene and CH3I using guided ion-beam mass spectrometry. This value confirms the accuracy of a very precise spectroscopic value measured by Haber et al. [J. Chem. Phys. 144, 58 (1988)] and Tanaka and Jursa [J. Chem. Phys. 36, 2493 (1962)], IE(NO2)=9.586±0.002 eV, but is much lower than many other measurements that are limited by very unfavorable Franck–Condon factors. The mechanism that allows the charge-transfer reactions to occur at the thermodynamic limit is discussed by examining qualitative potential-energy surfaces for the charge-transfer processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463083
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  • 6
    Electronic Resource
    Electronic Resource
    Reaction of Zn+ with NO2. The gas-phase thermochemistry of ZnO (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7263-7268 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The homolytic bond dissociation energies of ZnO and ZnO+ have been determined by using guided ion-beam mass spectrometry to measure the kinetic-energy dependence of the endothermic reactions of Zn+ with nitrogen dioxide. The data are interpreted to yield the bond energy for ZnO, D00=1.61±0.04 eV, a value considerably lower than previous experimental values, but in much better agreement with theoretical calculations. We also obtain D00(ZnO+)=1.67±0.05 eV, in good agreement with previous results. Other thermochemistry derived in this study is D00(Zn+–NO)=0.79±0.10 eV and the ionization energies, IE(ZnO)=9.34±0.02 eV and IE(NO2)=9.57±0.04 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461403
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  • 7
    Electronic Resource
    Electronic Resource
    The gas-phase thermochemistry of TiH (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1228-1233 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The homolytic bond dissociation energy of the titanium neutral hydride D0(Ti–H) is determined experimentally for the first time by using guided ion beam tandem mass spectrometry to measure the kinetic energy dependence of the endothermic hydride abstraction reactions of Ti+ with methylamine, dimethylamine, and trimethylamine. From the thresholds of these reactions, the value of D0(Ti–H)=2.12±0.09 eV (48.9±2.1 kcal/mol) at 298 K is derived. Other 298 K thermodynamic values obtained are D0(Ti+–H−)=8.19±0.09 eV (188.8±2.1 kcal/mol), I.E.(TiH)=6.59±0.14 eV, P.A.(Ti−)=15.64±0.09 eV (360.6±2.1 kcal/mol), and ΔfH(TiH)=116.4±2.3 kcal/mol. This thermochemistry is compared with theoretical values and its relationship to hydride bond energies for the other first row transition metals is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461154
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  • 8
    Electronic Resource
    Electronic Resource
    Reaction of Sc+, Ti+, and V+ with CO. MC+ and MO+ bond energies (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 3387-3393 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reactions of Sc+, Ti+, and V+ with CO are studied as a function of translational energy in a guided-ion-beam tandem mass spectrometer. Formation of both metal-carbide and metal-oxide ions are observed and rationalized by a direct atom abstraction mechanism. At high energies, the ScC+ and ScO+ cross sections exhibit additional features that are unusual but can be explained by an impulsive pairwise mechanism and formation of excited-state product ions, respectively. Thresholds of the reaction cross sections are interpreted to give the 0 K bond energies (in eV) D0(ScC+)=3.34±0.06, D0(TiC+)=4.05±0.24, D0(VC+)=3.87±0.14, D0(ScO+)=7.11±0.08, D0(TiO+)=6.88±0.07, and D0(VO+)=5.81±0.17. Additional studies are used to help verify the bond energy for ScO+ and yield a recommended value of 7.14±0.11 eV. The nature of the bonding in MO+ and MC+ is discussed and compared for these three metal ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460844
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  • 9
    Electronic Resource
    Electronic Resource
    Reactions of fourth-period metal ions (Ca+−Zn+) with O2: Metal-oxide ion bond energies (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 2676-2691 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Reactions of Ca+, Zn+ and all first-row atomic transition metal ions with O2 are studied using guided ion beam techniques. While reactions of the ground states of Sc+, Ti+, and V+ are exothermic, the remaining metal ions react with O2 in endothermic processes. Analyses of these endothermic reactions provide new determinations of the M+–O bond energies for these eight elements. Source conditions are varied such that the contributions of excited states of the metal ions can be explicitly considered for Mn+, Co+, Ni+, and Cu+. Results (in eV) at 0 K are D0(Ca+–O)= 3.57±0.05, D0(Cr+–O)=3.72±0.12, D0(Mn+–O)=2.95±0.13, D0(Fe+–O)=3.53±0.06 (reported previously), D0(Co+–O)=3.32±0.06, D0(Ni+–O) =2.74±0.07, D0(Cu+–O)=1.62±0.15, and D0(Zn+–O)=1.65±0.12. These values along with literature data for neutral metal oxide bond energies and ionization energies are critically evaluated. Periodic trends in the ionic metal oxide bond energies are compared with those of the neutral metal oxides and those of other related molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458906
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  • 10
    Electronic Resource
    Electronic Resource
    Conversion of CH4 to CH3OH: Reactions of CoO+ with CH4 and D2, Co+ with CH3OD and D2O, and Co+(CH3OD) with Xe (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 7815-7826 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00096a044
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