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  • 1
    Electronic Resource
    Electronic Resource
    High-order multiphoton ionization photoelectron spectroscopy of nitric oxide (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1307-1312 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Resonance-enhanced and nonresonant five- and six-photon ionization of NO was studied using angle resolved photoelectron spectroscopy. The (3+3) resonance-enhanced multiphoton ionization photoelectron spectrum (REMPI-PES) of NO via the A 2 Σ+ (v=0) level yielded a distribution of electron energies corresponding to all accessible vibrational levels (v+ =0–6) of the nascent ion. The observed energy distributions suggest near resonant enhancement due to vibrational levels of the D 2 Σ+ and C 2 Π states at the fourth photon level. Angular distributions of photoelectrons corresponding to v+ =0 and v+ =3 (rotationally unresolved) were significantly different, perhaps reflecting these different pathways. The (3+2) REMPI via the A 2 Σ+ (v=1) level produced only one low-energy electron peak corresponding to v+ =1. Nonresonant MPI at 532 nm yielded a distribution of photoelectron energies corresponding to both four- and five-photon ionization. Prominent peaks in the five-photon ionization photoelectron spectrum show that near resonant enhancement occurs via the A 2 Σ+ (v=5), the C 2 Π(v=2) and the D 2 Σ+ (v=1) states at the three-photon level. This study amply demonstrates the utility of angle resolved MPI-PES in understanding high-order multiphoton ionization processes. Finally, measurements of the ratio of NO+ ion signal for circular and linear polarized light when tuning near the A 2 Σ+ (v=0) and A 2 Σ+ (v=1) levels are reported and compared with theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456125
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  • 2
    Electronic Resource
    Electronic Resource
    Isotope-dependent rate constants for CS−2 formation in Cs (ns,nd)+CS2 collisions (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 5751-5752 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Negative ion formation during collisions between Cs (ns,nd) Rydberg atoms and CS2 molecules has been studied for intermediate values of the effective principal quantum number (n*=10–26). Rate constants for CS−2 formation are found to be different for the two isotopes C32S34S and C32S32S for a narrow range of n* near n*=17, with the rate constant for 12C32S34S− production being up to 4.5 times larger than that for 12C32S32S−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458506
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  • 3
    Electronic Resource
    Electronic Resource
    Low-Energy Electron Attachment to C60 (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 1719-1726 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100006a013
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  • 4
    Electronic Resource
    Electronic Resource
    On the binding of electrons to nitromethane: Dipole and valence bound anions (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 3472-3478 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Conventional (valence) and dipole-bound anions of the nitromethane molecule are studied using negative ion photoelectron spectroscopy, Rydberg charge exchange and field detachment techniques. Reaction rates for charge exchange between Cs(ns,nd) and Xe(nf ) Rydberg atoms with CH3NO2 exhibit a pronounced maximum at an effective quantum number of n*≈13±1 which is characteristic of the formation of dipole-bound anions [μ(CH3NO2)=3.46 D]. However, the breadth (Δn≈5, FWHM) of the n-dependence of the reaction rate is also interpreted to be indicative of direct attachment into a valence anion state via a "doorway'' dipole anion state. Studies of the electric field detachment of CH3NO−2 formed through the Xe(nf ) reactions at various n values provide further evidence for the formation of both a dipole-bound anion as well as a contribution from the valence bound anion. Analysis of the field ionization data yields a dipole electron affinity of 12±3 meV. Photodetachment of CH3NO−2 and CD3NO−2 formed via a supersonic expansion nozzle ion source produces a photoelectron spectrum with a long vibrational progression indicative of a conventional (valence bound) anion with a substantial difference in the equilibrium structure of the anion and its corresponding neutral. Assignment of the origin (v′=0, v″=0) transitions in the photoelectron spectra of CH3NO−2 and CD3NO−2 yields adiabatic electron affinities of 0.26±0.08 and 0.24±0.08 eV, respectively. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472993
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