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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the F+H2 transition state region via photoelectron spectroscopy of the FH−2 anion (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5352-5353 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoelectron spectrum of the FH−2 anion is reported. The spectrum provides a probe of the transition state region for the F+H2 reaction. The experimental spectrum is compared to the recent simulation by Zhang and Miller which assumes the T5a potential energy surface for the F+H2 reaction. The experimental spectrum is substantially broader. While this may be due to inaccuracies in the T5a surface, the possibility of additional transitions to low-lying excited electronic surfaces not included in the simulation must also be considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459721
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  • 2
    Electronic Resource
    Electronic Resource
    Study of the transition state region in the Cl+HCl reaction by photoelectron spectroscopy of ClHCl− (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1463-1465 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454218
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  • 3
    Electronic Resource
    Electronic Resource
    Autodetachment spectroscopy and dynamics of CH2CN− and CD2CN− (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 6842-6853 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The technique of autodetachment spectroscopy is utilized in a study of two electronic states of CH2CN− and CD2CN−. The ground electronic state is a normal valence state while the outermost electron in the excited state is bound by the dipole moment of the neutral radical. Autodetachment occurs from excited rotational levels of this dipole bound state, giving some 5000 sharp features near the photodetachment threshold. All of these features were assigned and spectroscopic constants for both states are reported. The binding energy of the electron in this latter state is determined to be (approximately-less-than)66 cm−1 and analysis of the autodetachment spectrum shows the electron affinities of CH2CN and CD2CN to be ∼12 500 and ∼12 430 cm−1, respectively. The dynamics of the autodetachment process is studied and various mechanisms for detachment are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453379
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  • 4
    Electronic Resource
    Electronic Resource
    Vibrationally resolved photoelectron spectra of Si−3 and Si−4 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6108-6110 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoelectron spectra of the Si−3 and Si−4 cluster anions have been obtained at 355 and 266 nm. The spectra show transitions to the ground and low-lying excited electronic states of the neutral clusters. Several of the electronic bands show resolved vibrational structure. The electronic state energies and vibrational frequencies are compared to recent ab initio calculations. The Si−4 spectrum is consistent with the prediction of a planar, symmetric rhombus for the ground state of Si4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459004
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  • 5
    Electronic Resource
    Electronic Resource
    Examination of the Br+HI, Cl+HI, and F+HI hydrogen abstraction reactions by photoelectron spectroscopy of BrHI−, ClHI−, and FHI− (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 7205-7222 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoelectron spectra of the ions BrHI−, ClHI−, and FHI−, along with their deuterated counterparts, are presented. These spectra provide information on the transition state region of the potential energy surfaces describing the exothermic neutral reactions X+HI→HX+I(X=Br, Cl, F). Vibrational structure is observed in the BrHI− and ClHI− spectra that corresponds to hydrogen atom motion in the dissociating neutral complex. Transitions to electronically excited potential energy surfaces that correlate to HX+I(2P3/2,2P1/2) products are also observed. A one-dimensional analysis is used to understand the appearance of each spectrum. The BrHI− spectrum is compared to a two-dimensional simulation performed using time-dependent wave packet propagation on a model Br+HI potential energy surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458208
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  • 6
    Electronic Resource
    Electronic Resource
    Autodetachment study of the electronic spectroscopy of FeO− (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1858-1867 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The anion FeO− was studied by autodetachment spectroscopy in a coaxial laser–ion beam photodetachment spectrometer. Transitions were observed between the ground electronic state of the ion and several excited electronic states near the electron detachment threshold. Rotational assignments were carried out for several bands, and the measured linewidths yielded autodetachment lifetimes as a function of rotational energy for these bands. The results indicate a 4Δ ground state of FeO−. The autodetachment lifetimes show that some of the excited electronic states are dipole bound, and that one weakly bound state may be a valence excited state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452137
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  • 7
    Electronic Resource
    Electronic Resource
    Examination of the 2A'2 and 2E‘ states of NO3 by ultraviolet photoelectron spectroscopy of NO−3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 1740-1751 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoelectron spectrum of the NO−3 anion has been obtained at 266 and at 213 nm. The 266 nm spectrum probes the 2A'2 ground state of NO3. The 213 nm spectrum represents the first observation of the 2E‘ lowest-lying excited state of NO3. The 2A2 band shows vibrational progressions in the ν1 symmetric stretch and the ν4 degenerate in-plane bend of NO3. Our analysis of this band indicates that the NO3 ground state has a D3h equilibrium geometry and is vibronically coupled to the 2E' second excited state via the ν4 mode. We also obtain the electron affinity of NO3, 3.937±0.014 eV, and the heat of formation of NO3 at 298 K, 0.777±0.027 eV (17.9±0.6 kcal/mol). The 2E‘ state of NO3 lies 0.868±0.014 eV above the ground state. The 2E‘ band shows complex and extensive vibrational structure. Several possible assignments of this structure are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459947
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  • 8
    Electronic Resource
    Electronic Resource
    Observation of the A˜(2B2) and C˜(2A2) states of NO2 by negative ion photoelectron spectroscopy of NO−2 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2070-2071 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455999
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  • 9
    Electronic Resource
    Electronic Resource
    Molecular beam studies of the F+H2 reaction (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 3045-3066 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamics of the F+H2 reaction have been investigated in a high resolution crossed molecular beam study. Differential cross sections and kinetic energy distributions were obtained for each HF vibrational state. The v=1 and v=2 states were predominantly backward scattered, but substantial forward scattering was observed for HF (v=3) over the range of collision energies accessible in our apparatus, from 0.7 to 3.4 kcal/mol. The results strongly suggest that dynamical resonances play a significant role in the reaction dynamics of F+H2 and that resonance effects are most prominent in the v=3 product channel. Quantal reactive scattering calculations on F+H2 predict that the v=2 channel should be most strongly affected by resonances. This discrepancy is attributed to inadequacies in the potential energy surface used in the calculations, and several modifications to the surface are proposed based on the experimental results. Other features of the reaction are also discussed, including the integrated partial cross sections, the effect of H2 rotation, and the reactivity of F(2P1/2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448254
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  • 10
    Electronic Resource
    Electronic Resource
    Molecular beam studies of the F+D2 and F+HD reactions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 3067-3077 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The F+D2 and F+HD reactions were investigated in a high resolution crossed molecular beams experiment at several collision energies. The DF product from both reactions was predominantly backward scattered although some forward scattered DF(v=4) was observed at the highest energy studied. The HF angular distributions from F+HD were quite different, showing considerable forward scattered (v=3) and no other identifiable structure. These results disagree with classical trajectory studies, which predict only small variations in the product angular distributions among F+H2 and its isotopic variants. They agree, however, with the predicted dependence of dynamical resonance effects on isotopic substitution. The results therefore support the conclusions drawn in the previous paper regarding the role of dynamical resonances in the F+H2 reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448255
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