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  • 1
    Electronic Resource
    Electronic Resource
    The phenol dimer: Zero-kinetic-energy photoelectron and two-color resonance-enhanced multiphoton ionization spectroscopy (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 1933-1943 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The two-color, two-photon (1+1') resonance-enhanced multiphoton ionization spectrum of the hydrogen-bonded phenol dimer has been recorded in reasonable agreement with previously reported spectra. However, more features are obtained in this work and this has allowed a more detailed analysis of the spectrum. Five intermolecular vibrations (out of a possible six) are observed for the S1donor state, while only two modes are obtained for the S1acceptor state. Zero-kinetic-energy (ZEKE) photoelectron spectra were recorded via different intermediate vibronic states. The spectrum recorded via the vibrationless level of the S1donor state is rich in structure and indicates a large change in the geometry on ionization. Progressions in the intermolecular stretch mode and at least one other mode are obtained. ZEKE spectra were also recorded via a number of S1donor vibronic levels, and the S1acceptor vibrationless level. The lowest value measured for the ionization energy of the donor is 63 649±4 cm−1 (7.8915±0.0005 eV); this is over 2000 cm−1 lower than the previously reported value. No structure is resolved in the ZEKE spectrum of the acceptor, and it is suggested that this could be due to rapid internal conversion between the S1acceptor and S1donor states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464227
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  • 2
    Electronic Resource
    Electronic Resource
    Implementation of a high-resolution two-color spectrometer for rotational coherence spectroscopy in the picosecond time domain (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 2697-2708 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-resolution two-color spectrometer for rotational coherence spectroscopy (RCS) in the picosecond time domain has been developed and applied to several molecular systems. This time-resolved method enables the structural characterization of large molecules and clusters in the gas phase by determination of their rotational constants with high precision. Our spectrometer is based on a well stabilized solid-state chirped pulse amplified laser setup with an adjustable pulse duration in the picosecond range. Two optical parametric generators provide tunable radiation in the UV spectral range, with a pulse duration of 2 ps. An interferometric setup is employed in order to perform pump–probe experiments with up to 8 ns delay between pump and probe pulse. Two different pulse to pulse switching modes and the online monitoring of laser parameters have been integrated to enable the measurement of RCS traces with high resolution and good signal/noise ratio. These modes also permit the identification of weak features that would otherwise not have been observed. The molecular samples are prepared in a supersonic expansion and either the laser induced fluorescence or the photoion current are detected as a function of the time delay between pump and probe pulse. The performance of the spectrometer is demonstrated by recording a high-resolution RCS spectrum of para-difluorobenzene⋅argon and benzene. From their analysis the rotational constants of the ground state and electronically excited state of both species were obtained with an estimated uncertainty on the order of 10−4 and 10−5, respectively, in excellent agreement with high-resolution frequency-resolved data. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1370559
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  • 3
    Electronic Resource
    Electronic Resource
    Fragmentation energetics and dynamics of fluorobenzene⋅Arn (n=1–3) clusters studied by mass analyzed threshold ionization spectroscopy (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 6156-6165 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dissociation of fluorobenzene⋅Arn (n=1–3) complexes was investigated using mass analyzed threshold ionization spectroscopy. All ion state spectra of the cationic complexes exhibit low-frequency vibrational progressions of van der Waals bending modes, which indicate a significant structural change of the complexes upon ionization. Upper limits for the dissociation thresholds in the cationic state could be determined for all complexes. In the case of fluorobenzene⋅Ar2 and fluorobenzene⋅Ar3, two fragmentation thresholds could be observed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474281
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