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  • 1
    Electronic Resource
    Electronic Resource
    Product fine structure state populations and nonadiabatic dissociation dynamics: Cl*(2P1/2)/Cl(2P3/2) branching ratio in the visible and near ultraviolet photodissociation of nitrosyl chloride (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 9653-9660 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Chlorine atoms in their 2Pj states were observed using resonance-enhanced multiphoton ionization and time-of-flight techniques, following the photodissociation of nitrosyl chloride at preselected wavelengths (i.e., 600, 562, 478, and 355 nm). The fine structure branching ratio and the spatial anisotropy parameter were determined. Combining these observations with results from previous studies, a complete picture about product fine structure state populations is obtained. The observed fine structure populations are explained with the aid of a new correlation diagram in the Cs point group. The adiabatic, nonadiabatic, and diabatic dissociation dynamics involving several avoided crossings at large interfragment separations are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469980
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  • 2
    Electronic Resource
    Electronic Resource
    Atomic photofragment v–j correlation: Dissociation of Cl2 at 355 nm (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 808-814 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of Cl2 at 355 nm was studied by measuring the angular distribution of the chlorine fragments in their electronic ground state (2P3/2). Resonance-enhanced multiphoton ionization and time-of-flight (TOF) techniques were combined to obtain state-selective photofragment TOF profiles. It was observed that the shape of these photofragment TOF profiles depends sensitively on the polarizations of both the photolysis and the probe lasers. The dependence on the photolysis laser polarization reveals the angular distribution of the photofragments whereas the dependence on the probe laser polarization can be understood in terms of the atomic photofragment v–j correlation. Since the ground state Cl fragment has an electronic angular momentum greater than 1/2 (h-dash-bar), it can be aligned along the direction of fragment recoil. A theoretical treatment based on the adiabatic approximation is presented here to explain the observed polarization dependence of the photofragment TOF profiles. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469195
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  • 3
    Electronic Resource
    Electronic Resource
    The nonadiabatic photodissociation of BrNO at 355 nm (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 3395-3398 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Nozzle cooled BrNO molecules were dissociated with a polarized laser at 355 nm. The NO fragments were then state-selectively probed using a second tunable laser. Resonance-enhanced multiphoton ionization and fragment time-of-flight techniques were combined to obtain scalar and vector properties of the NO fragment. For each of the NO states probed, the Br*/Br ratio was determined. From these data, a comprehensive picture of the dissociation process was obtained. The excitation at 355 nm has a transition dipole moment parallel to the Br–N bond (β≈2.0). The NO fragment was observed with high rotational excitation (J≈50) and nonstatistical spin–orbit and Λ-doublet state distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467586
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  • 4
    Electronic Resource
    Electronic Resource
    Laser-induced fluorescence spectroscopy of the A˜ 1Πu–X˜ 1Σ+g transition in jet-cooled C3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 10343-10349 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: C3 radicals have been produced in a plasma of rhenium with methane doped in helium and cooled in a supersonic free jet expansion. More than 50 vibronic bands in the laser induced fluorescence spectrum of the A˜ 1Πu–X˜ 1Σ+g electronic transition have been recorded in the region 370–415 nm at 0.4 cm−1 resolution. The observations include bands identified by Gausset et al. (1965) and many bands not previously characterized. Rotational analyses have been made for a majority of the bands and the number of located Renner–Teller levels of the A˜ state has been considerably extended. The (002) level is tentatively identified. A comparison of the experimentally determined energy level pattern in the A˜ state with theoretical predictions has suggested a number of revisions to previous assignments and evidence is presented to contradict suggestions from earlier work that the (020) level of the A˜ state is perturbed. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467914
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  • 5
    Electronic Resource
    Electronic Resource
    Electronic spectroscopy of jet-cooled iron monocarbide. The 3Δi←3Δi transition near 493 nm (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 4046-4051 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the first gas phase spectroscopic study of iron monocarbide. FeC molecules were generated in a laser vaporization molecular beam source and detected by laser induced fluorescence. Twenty-six vibronic bands have been recorded in the 430–500 nm region. Rotational analyses have been carried out for 22 of the bands. There are three lower states involved, two with Ω″=2 and one with Ω″=3. Based on our experimental observations and the ab initio calculations on RuC [Shim et al. J. Phys. Chem. 91, 3171 (1987)] the observed bands are interpreted as 3Δi←3Δi and 1Δ←1Δ transitions. The ground state electronic configuration is assigned to 1δ39σ1. Evidence for three excited electronic states (one 3Δi state, one 1Δ state and another state with Ω′=3) and for perturbations in several of their vibrational levels is presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469590
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