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  • American Institute of Physics (AIP)  (4)
  • 1990-1994  (4)
Document type
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    High resolution threshold photoelectron spectroscopy of aniline and aniline van der Waals complexes (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2843-2860 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Zero electron kinetic energy threshold photoelectron spectroscopy is applied to jet cooled aniline and the van der Waals molecules aniline–Ar, aniline–(Ar)2, and aniline–CH4. The monomer cation spectrum is assigned and more precise values of the vibrational frequencies are determined. The spectra of the cation complexes reveal significant vibronic activity indicative of a significant change in complex geometry upon ionization. The change in complex binding energy upon ionization is obtained from a determination of the complex ionization potentials. For the first time zero electron kinetic energy is used to probe van der Waals complex predissociation on the S1 electronic surface. Both reactants (complex) and products (monomer) of the reaction are observed in the photoelectron spectrum. Details of the mechanism of the zero electron kinetic energy threshold photoionization process and its impact on the observation of van der Waals molecules are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463027
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aniline-CH4 S1 vibrational dynamics studied with picosecond photoelectron spectroscopy (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2550-2559 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Intramolecular vibrational energy redistribution (IVR) and vibrational predissociation (VP) are measured for a number of vibronic states in the S1 electronic state of the aniline-CH4 complex. The detailed dynamics are monitored using picosecond threshold photoelectron spectroscopy which is shown to be a sensitive probe of van der Waals molecule dynamics. For the lowest vibrational states accessed, the 6a10 and 6a10+24 cm−1 bands, both IVR and VP are observed and their rates are independently determined. At higher excess energy, IVR becomes the rate limiting step and the rate for VP cannot be measured independently. The results are interpreted using a serial dissociation mechanism with a simple kinetic model description. The rates of the reaction are modeled using standard Rice–Ramsperger–Kassel–Marcus (RRKM) theory which qualitatively predicts rates consistent with the experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465218
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamics of high n molecular Rydberg states with application to mass analyzed threshold ionization spectroscopy (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3133-3136 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Studies are performed which measure the lifetime of very high lying molecular Rydberg states which play a central role in high resolution threshold ionization spectroscopy. The molecular systems investigated are styrene, phenol, and phenanthrene as well as the atomic iron system for comparison. It is shown that the lifetimes of the highest lying levels are determined not by intramolecular nonradiative processes but by intermolecular Rydberg–ion or Rydberg–Rydberg interactions. Under low fluence laser excitation, the highest lying Rydberg states are observed to have a lifetime greater than 25 μs but under high fluence the observed lifetime is ∼4 μs. The long Rydberg lifetimes are utilized to implement a simplified spectrometer for mass analyzed threshold ionization (MATI) spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465168
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Picosecond vibrational dynamics of several S1 bands in jet-cooled p-difluorobenzene (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 2429-2436 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Picosecond pump–probe threshold photoelectron spectroscopy was used to investigate the vibrational dynamics of four vibrational bands in the S1 state of p-difluorobenzene in the range 2000 to 2900 cm−1. In this energy region the vibrations exhibited intermediate case restricted vibrational dynamics as evidenced by observed quantum beats as well as irreversible statistical limit decay. More complete coverage of the S1 state was prohibited by the wavelength restrictions on both the pump and probe laser wavelengths required in the experiment. The observed restricted vibrational redistribution is in contrast to the very rapid irreversible decays inferred from room temperature, high pressure chemical timing experiments on the same molecular bands. The differences are discussed in terms of the role of molecular rotations and the possible different experimental observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466491
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    Paper (German National Licenses)
    Fulltext
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