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  • 1
    Electronic Resource
    Electronic Resource
    Mode-dependent vibrational autoionization in aniline (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 4190-4202 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High-resolution photoelectron spectroscopy is used to study the branching ratios for vibrational autoionization of Rydberg states of aniline (C6H5NH2) converging to the ground electronic state of the ion. By using two-color double-resonance excitation, it is possible to prepare autoionizing resonances in which two different vibrational modes are excited. Determination of the vibrational state distribution in the product ion provides information on the relative rates of autoionization for the two modes. It is found that some normal modes appear to be especially effective at promoting vibrational autoionization, while others appear to be completely ineffective. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1288144
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  • 2
    Electronic Resource
    Electronic Resource
    Multichannel Quantum Defect Theory and Double-Resonance Spectroscopy of Autoionizing Levels of Molecular Hydrogen (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 1700-1710 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100006a011
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  • 3
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopy of autoionizing Rydberg states of ammonia (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 4153-4161 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoelectron spectroscopy was used to determine the ionic vibrational distributions following vibrational autoionization of Rydberg states of NH3. Two-color, two-photon resonant, three-photon excitation via selected rotational levels of the NH3 C˜′ 1A1′(0200) intermediate state was employed to populate vibrationally autoionizing Rydberg states between the v2+=1 and v2+=2 ionization thresholds of the NH3+ X˜ 2A2″ ground electronic state. As expected from the propensity rule for vibrational autoionization, ionization with Δv2=−1 was found to be the dominant process. The observed vibrational distributions appear to be independent of the rotational quantum number of the autoionizing state. Partially resolved rotational structure was exhibited within the photoelectron spectra providing information on the assignments of the Rydberg states and on the mechanism for vibrational autoionization. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480962
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  • 4
    Electronic Resource
    Electronic Resource
    Double-resonance spectroscopy of autoionizing states of ammonia (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 2815-2825 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New double-resonance ionization data are presented on the autoionizing Rydberg states of NH3 excited via selected rotational levels of the C˜′ 1A1(0100) and (0200) states. Extrapolation of the Rydberg series provides a determination of the adiabatic ionization energy of NH3 that is in excellent agreement with that obtained by using zero kinetic energy photoelectron spectroscopy (ZEKE-PES). A comparison is presented between the field-free spectrum obtained by using a time-of-flight mass spectrometer and the 1-Tesla-spectrum obtained by using a magnetic-bottle electron spectrometer. Finally, the rotational and vibrational autoionization mechanisms are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480856
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  • 5
    Electronic Resource
    Electronic Resource
    Vibrational autoionization and predissociation in high Rydberg states of nitric oxide (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 7131-7140 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: New results on the competition between autoionization and predissociation in the high Rydberg states of nitric oxide are presented. These results provide insight into the earlier work of Park et al. [Phys. Rev. Lett. 76, 1591 (1996)] that shows evidence for substantial mixing between Rydberg series and ionization continua with even and odd orbital angular momenta (l). New data based on fluorescence-dip spectroscopy, detection of neutral predissociation products, and photoelectron spectroscopy suggest that the A′ 2Σ+ and I 2Σ+ dissociative valence states play an important role in this l mixing. Zeeman splittings observed in a magnetic bottle electron spectrometer also result in an improvement in the assignment of these high Rydberg states. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476130
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  • 6
    Electronic Resource
    Electronic Resource
    Two-photon spectroscopy of HI in the 69 600–73 600 cm−1 region (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 1882-1888 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Several new electronic states in HI have been identified from resonance-enhanced multiphoton ionization (REMPI) spectra in the 69 600–73 600 cm−1 region. These results have been combined with previously unpublished single-photon absorption data and, in selected wavelength regions, with REMPI spectra of DI to provide a more complete description of the excited electronic structure of HI up to ∼9.2 eV above the ground state. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468753
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  • 7
    Electronic Resource
    Electronic Resource
    Multistate interactions in nitric oxide probed by laser-induced grating spectroscopy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 4740-4746 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two-color laser-induced grating spectroscopy (TC-LIGS) via the A 2Σ+, v'=0 state has been used to study the B 2Π, v=28 and L 2Π, v=8 valence states and the Q 2Π, v=0 5pπ Rydberg state of NO. Energies for previously unobserved or unresolved transitions to the perturbed L 2Π1/2,3/2, v=8 and Q 2Π1/2,3/2, v=0 states are reported for the first time. The interaction between these states is reconsidered in light of the new assignments. A comparison of different detection methods made for the B 2Π1/2,3/2, v=28←A 2Σ+, v'=0 transitions demonstrates the ability of TC-LIGS to detect states that are difficult to detect by ionization or fluorescence-dip detection. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469522
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  • 8
    Electronic Resource
    Electronic Resource
    Reactions of Rydberg states of molecular hydrogen (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 882-890 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Rydberg state reaction H*2+H2→H+3+H+e− was studied by exciting the (X 2∑+g)np,v=0,J Rydberg states with n=30–70 by double resonance excitation via the E,F 1∑+g,v=0,J=1 level and by detecting the product ions or electrons. The results are consistent with the reaction occurring between the ion core of the Rydberg molecule and the ground state molecule, with the Rydberg electron acting as a spectator. Thus, these reactions can be used to provide information on the analogous ion–molecule reactions, and the possibility of using the Rydberg state reactions to study the rotational state dependence of the corresponding ion–molecule reactions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467741
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  • 9
    Electronic Resource
    Electronic Resource
    Zero kinetic energy, pulsed-field ionization spectroscopy of hydrogen iodide (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 8302-8309 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotationally resolved, zero kinetic energy, pulsed-field ionization (ZEKE-PFI) spectrum of the HI+ X 2Π1/2, v+=0 level, obtained by double-resonance excitation via the HI F 1Δ2, v=0 level, is reported. The rotational and Λ-doubling constants for the HI+ X 2Π1/2, v+=0 level obtained from the experiment are close to those estimated theoretically by Mank et al. [J. Chem. Phys. 95, 1676 (1991)]. At higher pressures, the dissociative charge transfer reaction HI*+HI→HI++H+I− represents a potentially serious loss mechanism for the high Rydberg states that give rise to the ZEKE-PFI signal. This result is of more general applicability, because it provides evidence that collisions of the Rydberg electron with neighboring molecules can play a significant role in ZEKE-PFI experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468096
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  • 10
    Electronic Resource
    Electronic Resource
    Photoionization dynamics of excited molecular states: D2 C 1Πu (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 4423-4428 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The three photon resonant, four photon ionization spectra of D2 via the C 1Πu, v′=0–4 levels are reported. The photoelectron spectra for all five bands and the photoelectron angular distribution via the C 1Πu, v′=0–3←X 1∑+g, v″=0, Q(3) transitions are also reported. The photoelectron spectra are compared with theoretical Franck–Condon factors determined using accurate potential curves for the D2 C 1πu and D+2 X 2∑+g states. As in the case of H2, the photoelectron spectra display non-Franck–Condon behavior, and the photoelectron angular distributions exhibit strong v+ dependences. The relation of the present results to earlier results on H2 is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452854
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