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  • 2000-2004  (1)
  • 1985-1989  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    Ionization and fragmentation of C60 with sub-50 fs laser pulses (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 2781-2789 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Gas-phase C60 photoionization and photofragmentation experiments were performed using a sub-50 fs Ti Sapphire laser system and reflectron time-of-flight (RETOF) mass spectrometer. The dependence of the C60+ and C602+ signals on the laser intensity for the fundamental (795 nm) and second harmonic (ca. 400 nm) has been determined. For low laser intensities, before the onset of fragmentation, single ionization is a direct multiphoton process. Double ionization is a sequential process in which C602+ originates from already singly ionized fullerenes. At laser intensities beyond the onset of C602+ there is considerable metastable fragmentation indicating a strong coupling of electronic excitation energy into vibrational degrees of freedom that appears to be in competition with multiple ionization. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.480852
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  • 2
    Digitale Medien
    Digitale Medien
    Erratum: Photoionization of single rotational levels in excited B 2Π, C 2Π, and D 2Σ+ states of 14N16O [J. Chem. Phys. 83, 4831 (1985)] (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 7058-7058 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.450864
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  • 3
    Digitale Medien
    Digitale Medien
    Rotational state selective photoionization of the H2 molecule from B 1Σ+u(v '=0,3) states (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4360-4363 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Selective photoionization from single rotational states of the B 1Σ+u(v'=0 and 3) excited state of the H2 molecule has been investigated with fixed frequency and tunable laser radiation around λ=266 nm. State selection of the B-state levels was achieved by tunable VUV laser excitation around λ=110 and 106 nm, respectively. The ionization cross section has been determined for different states, and found to be critically dependent upon the initial rotational quantum state and to show pronounced spectral structure with the ionization wavelength. At λI=266.05 nm the cross section varies between 0.23×10−18 and 1.2×10−18 cm2, depending on the initial state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.449051
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  • 4
    Digitale Medien
    Digitale Medien
    Photoionization of single rotational levels in excited B 2Π, C 2Π, and D 2Σ+ states of 14N16O (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4831-4844 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Rotational state selective fluorescence excitation and two-color resonantly enhanced ionization of nitric oxide has been investigated under collision free conditions. Single photon absorption from a tunable VUV laser source prepared the molecules in the intermediate B 2Π, C 2Π, and D 2Σ+ states energetically close to the dissociation limit of NO. The dissociation of C 2Π(v'=0) at J'=2.5(2Π3/2) and J'=3.5(2Π1/2) as well as B 2Π(v'=7) at J'=4.5(2Π3/2) and J'=7.5 (2Π1/2) was clearly established. Time delayed photoionization was used to measure the lifetimes of stable and weakly predissociative states. Photoionization cross sections of single rotational levels in the electronically excited states have been determined by saturating the ionization step.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.449744
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  • 5
    Digitale Medien
    Digitale Medien
    Multiphoton-ionization of hydrogen atoms in intense laserfields (1988)
    Springer
    The European physical journal 10 (1988), S. 35-43 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 32.80.Rm
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The interaction of hydrogen atoms with strong laser fields at intensities up to some 1013 W cm−2 was studied experimentally at the wavelengths λ=355 nm, 532 nm and 1064 nm. The ion yield, the energy spectrum of the photoelectrons and their angular distributions were measured. The angular distributions at λ=355 nm and λ=532 nm provide a sensitive test for theoretical calculations. Comparison with the calculations available shows that perturbation theory with proper inclusion of atomic structure yields results which agree with experiment. Intensity dependent changes of angular distributions at λ=532 nm are observed, which indicate that at 1013 W cm−2 higher order processes become noticable. At λ=1064 nm the situation is more complicated, experimentally as well as theoretically. Intensities of some 1013 W cm−2 are necessary to observe ionization. Strong distortions of the atomic structure can be expected. Presently only qualitative aspects of the angular distributions can be discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425579
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