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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Resonant multiphoton ionization dynamics of N2 via the a 1Πg(v=10–14) states: Preparation of state-selected N+2 X 2Σ+g(v+=0–4) ions (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 7823-7827 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoelectron spectra are reported from resonantly enhanced multiphoton ionization of N2 via the a 1Πg(v=10–14) states. Ionization from these levels is found to follow a (2+1) pathway resulting in N+2 X 2Σ+g(v+=0–4) ions. The observed branching ratios in the photoelectron spectra reveal a strong propensity for forming ground state ions in a single vibrational state. The results are explained qualitatively by favorable Franck–Condon overlap in the ionizing X 2Σ+g–a 1Πg transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461311
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photoelectron angular distributions and vibrational branching ratios of CO (2+1)-photon ionization via the B 1Σ+ state (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 4334-4339 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present vibrational branching ratios and photoelectron angular distributions for resonantly enhanced (2+1)-photon ionization of CO. The excitation ladder involves the B 1Σ+(vi=0 or 1) Rydberg state. Contrary to expectations fostered by the Franck–Condon principle, ionization via vi=0 branches into vibrational states v+=0–4. Such phenomena are also observed in the case of vi=1, but only to a minor extent. The angular emission patterns of the photoelectrons ejected during the ionizing step are of distinct character in that they are highly anisotropic for Δv=vi−v+=0 processes, but show isotropy when due to Δv≠0 transitions. The photoelectron angular distribution which accompanies the Δv=0 ionization of B(vi=1) shows p-wave character, and hence we may postulate a spherical potential of the Rydberg ion core. The same approximation should hold for the vi=0 state. The dissimilar appearance of the angular distributions when ionizing from this level invites the hypothesis of two individually different ionization channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466087
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photoelectron angular distribution and ion vibrational branching ratio: The (2+1)-photon ionization of E 1Π-state-aligned CO molecules (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 7687-7695 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report vibrational level channeling and photoelectron angular distributions which characterize the single-step photoionization of the E 1Π Rydberg state of CO. Particular attention is paid to the influence of the intermediate state's rotational preparation and its spatial alignment. The two-photon excitation is tuned to populate the lowest possible J values of E, which permits us to isolate a single magnetic sublevel of this intermediate state. Vibrational branching is found to be insensitive to the choice of the excitation line and does not match the predictions suggested by the Franck–Condon factors for a CO E 1Π(v1)→CO+ X 2Σ+(v+) direct ionization. A competitive autoionization from the three-photon-energy state S1 may be responsible for this anomalous behavior. The phenomenological pattern of photoelectron distributions can in all cases be rationalized on the basis of the intermediate state alignment. A separate chapter of the discussion is devoted to P(2) pumping, since it provides a particularly simple situation where all excited molecules are oriented with their axes parallel to the light vector E, which makes this case tractable to a quantitative calculation. Its results show qualitative agreement with the experimental observations. The remaining discrepancy can be attributed to the autoionization which has not been considered in the calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465698
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    Paper (German National Licenses)
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