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  • 1
    Electronic Resource
    Electronic Resource
    Molecular beam studies of the photodissociation of benzene at 193 and 248 nm (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4222-4233 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation processes of benzene following excitation at 193 and 248 nm have been studied by molecular beam photofragmentation translational spectroscopy. When benzene was excited to the 1 B1u state by absorption at 193 nm, dissociation occurred through three primary channels, C6H5+H (80%), C6H4+ H2 (16%), and C5H3+CH3 (4%), following internal conversion to the vibrationally excited ground state. When benzene was excited to the 1 B2u state at 248 nm, two primary dissociation channels, C6H4+H2 (96%), and C5H3+CH3 (4%), were observed. Photodissociation to produce two C3H3 was induced by two photon absorption of benzene at both 193 and 248 nm. Numerous secondary photodissociation processes of the primary photoproducts were also observed at both 193 and 248 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457780
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  • 2
    Electronic Resource
    Electronic Resource
    Crossed molecular beams study of the reaction D+H2→DH+H at collision energies of 0.53 and 1.01 eV (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5719-5740 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper reports the first product differential cross section (DCS) measurements for the D+H2→DH+H reaction as a function of laboratory (LAB) scattering angle with sufficient resolution to resolve product DH vibrational states. Using a D-atom beam produced by the photodissociation of DI at 248 nm, product velocity and angular distributions were measured at 12 LAB angles at a nominal collision energy of 0.53 eV and at 22 LAB angles at a nominal collision energy of 1.01 eV with a crossed molecular beams apparatus. After correction of the raw product time-of-flight (TOF) spectra for modulated background, a comparison with recent exact quantum mechanical scattering calculations was made using a Monte Carlo simulation of the experimental conditions. The simulation showed that although the theoretical predictions agree qualitatively with the measurements, some significant discrepancies exist. Using the Monte Carlo simulation, a best-fit set of DH(v,j) DCS's which showed good agreement with the measurements was found. At the detailed level of the state-to-state DCS, significant differences were observed between theory and experiment for rotationally excited DH(v, j) products. The discrepancies observed suggest that some regions of the current ab initio H3 potential energy surfaces, particularly the bending potential at high energies, may need further examination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459566
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  • 3
    Electronic Resource
    Electronic Resource
    Symmetric stretch excitation of CH3 in the 193.3 nm photolysis of CH3I (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3383-3384 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New high resolution photofragment translational spectroscopy measurements on the 193.3 nm photolysis of CH3I reveal up to four quanta of ν1 C–H symmetric stretch excitation in the C–I bond fission channel. In addition these experiments show for the first time that C–H bond fission occurs at wavelengths longer than 185 nm with a quantum yield of ∼3%. The data yields upper bounds to the C–H bond dissociation energy in CH3I of 101±1 kcal/mol and for the C–I bond energy, 55.0±0.3 kcal/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454949
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  • 4
    Electronic Resource
    Electronic Resource
    Energetics and dissociative photodetachment dynamics of superoxide–water clusters: O2−(H2O)n, n=1–6 (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 3449-3455 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dissociative photodetachment of O2−(H2O)n=1–6 was studied at 388 and 258 nm using photoelectron–multiple-photofragment coincidence spectroscopy. Photoelectron spectra for the series indicate a significant change in the energetics of sequential solvation beyond the fourth water of hydration. Photoelectron–photofragment kinetic energy correlation spectra were also obtained for O2−(H2O)1–2, permitting a determination of the first and second energies of hydration for O2− to be 0.85±0.05 and 0.70±0.05 eV, respectively. The correlation spectra show that the peak photofragment kinetic energy release in the dissociative photodetachment of O2−(H2O) and O2−(H2O)2 are 0.12 and 0.25 eV, respectively, independent of the photon and photoelectron kinetic energies. The molecular frame differential cross section for the three-body dissociative photodetachment: O2−(H2O)2+hν→O2+2H2O+e− is also reported. The observed partitioning of momentum is consistent with either a sequential dissociation or dissociation from a range of initial geometries. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1342221
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  • 5
    Electronic Resource
    Electronic Resource
    Energy and angular distributions in dissociative photodetachment of O−4 (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 6949-6952 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An anisotropic product angular distribution has been observed in the dissociative photodetachment of O−4 at 523 nm. Energy and angular distributions of coincident O2 products from the process O−4+hν→O2+O2+e− were measured using translational energy spectroscopy in a fast ion beam. The angular distribution peaks perpendicular to the electric vector of the laser beam. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469133
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  • 6
    Electronic Resource
    Electronic Resource
    Photoelectron–multiple-photofragment coincidence spectrometer (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2268-2276 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new photoelectron–photofragment-coincidence spectrometer is described. Using a multiparticle time- and position-sensitive detector, this apparatus allows the study of dissociation processes of negative ions yielding three photofragments in coincidence with a photoelectron. The photoelectron spectrometer uses two detectors and works in time of flight mode, detecting 10% of the photoelectrons with an energy resolution of 5% at 1.3 eV as shown in studies of the photodetachment of O2−. A third detector is used for collection of multiple photofragments (up to 8) in coincidence. This multiparticle detector uses a crossed-delay-line anode and fast timing signals to encode the time- and position-of-arrival of multiple photofragments. The detector was demonstrated to record all three particles produced in a single three-body dissociation event, yielding an energy resolution of (approximate)15% ΔE/E at 0.7 eV in experiments on the three-body dissociative photodetachment of O6−. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149751
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  • 7
    Electronic Resource
    Electronic Resource
    Molecular beam studies of the photolysis of allene and the secondary photodissociation of the C3Hx fragments (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7327-7336 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Angle resolved time of flight (TOF) measurements of the fragments produced when allene is photolyzed at 193 nm are described. The two primary processes that have been identified from these measurements are the H+C3H3 and the H2+C3H2 channels. The quantum yields for these first steps are 0.89 and 0.11, respectively. Subsequent photolysis of the C3H3 radical produces H2+C3H, C3H2+H, and C2H2+CH, while the C3H2 produces C3+H2, C2H+CH, and C2H2+C. The translational energy distributions for each one of these steps have been derived using the forward convolution technique. These energy distributions reveal the exit barriers and other constraints on the potential energy surfaces that lead to the above stated products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461410
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  • 8
    Electronic Resource
    Electronic Resource
    Complete kinematic measurement of three-body reaction dynamics: Dissociative photodetachment of O6− at 532 nm (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 9215-9218 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurement of the translational energy partitioning in the three-body dissociative photodetachment of O6− (O6−+hν→O2+O2+O2+e−) at 532 nm is reported. Using photoelectron and photofragment translational energy spectroscopies in coincidence, a complete kinematic measurement of the three-body dissociation of neutral O6 is obtained. Vibrationally resolved product translational energy distributions are observed. The results provide insights into the structure, binding energy, and dissociation dynamics of O6− and O6 and illustrate a new approach to the study of three-body reaction dynamics. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477580
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  • 9
    Electronic Resource
    Electronic Resource
    Study of the low-lying electronic states of CCO by photoelectron spectroscopy of CCO− and ab initio calculations (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 9740-9747 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The low-lying electronic states of CCO have been investigated by photoelectron spectroscopy of CCO− at wavelengths of 266 and 355 nm in conjunction with ab initio calculations. Photodetachment is observed to occur to the X˜ 3Σ−, A˜ 3Π, a˜ 1Δ, and b˜ 1Σ+ electronic states of CCO. This marks the first observation of the low-lying singlet states. A revised value for the electron affinity of CCO is found to be 2.289±0.018 eV. These results are compared with CASPT2 ab initio calculations of the energetics and structure of the ground and excited states of CCO and CCO−. Using the measured electron affinity of CCO, the heats of formation Δf H0298(CCO)=3.99±0.20 eV and ΔfH0298(CCO−)=1.67±0.20 eV are determined. In addition, the C–C bond dissociation energies in CCO and CCO− are determined, as well as the H–CCO bond energy in HCCO. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473000
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  • 10
    Electronic Resource
    Electronic Resource
    Photoelectron–neutral–neutral coincidence studies of dissociative photodetachment (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 9876-9879 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoelectron–neutral–neutral coincidence spectra have been measured for the dissociative photodetachment of O4− (O4−+hν→O2+O2+e−) at 523 and 349 nm. The neutral photofragment translational energy spectrum, the photoelectron spectrum, and the correlations of the translational energy and photoelectron energy are presented here. The correlation spectra reveal phenomena that are not discernable in either one-dimensional measurement. Features are observed which indicate that non-Franck–Condon processes play a role in the dissociative photodetachment of O4− at 349 nm. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469954
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