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  • American Institute of Physics (AIP)  (4)
  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3434-3440 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The fluorescence from optically excited Ag atoms in Ar, Kr, and Xe matrices has been investigated in a time-resolved synchrotron-radiation study. A detailed energy dissipation model could be established from a systematic analysis of rise and decay times of all the observed fluorescence bands after pulsed excitation into the Ag (4d105p)2P1/2,3/2 levels, and by setting time windows between the excitation pulses in emission and emission-yield spectroscopy. Although the overall wavelength dependence of the decay time follows the λ3 law, the decay time is independent of λ within a given emission band. Finally, the role of energy transfer between Ag atoms and dimers for the evaluation of decay times is briefly addressed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1147-1151 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical properties of small Zn clusters, especially of Zn2 and Zn3, isolated in neon have been studied over a wide photon energy range by absorption, emission, and photoelectron spectroscopy. By employing emission yield spectroscopy the optical transitions of the dimer and the trimer could be unequivocally distinguished from those of higher clusters in the matrix. For Zn2, the experimental data compare reasonably well with calculations found in the literature. However, the ground state, which is usually calculated to be nonbinding, is found to be bound. The main absorption bands of at least three more Zn clusters, tentatively assigned to Zn4–Zn6, have been derived from the concomitant growth of bands in a systematic concentration study.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1623-1630 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic spectra of nickel atoms isolated in matrices of the four noble gases have been assigned in considerable detail. The associated experimental and theoretical study has unequivocally revealed that nickel atoms can simultaneously exist in two electronic ground states, 3d94s1:3D3 and 3d84s2:3F4, in argon, krypton, and xenon matrices where they also occupy at least three different trapping sites. In neon they appear to exist in one site and one state, 3d84s2:3F4, only. In argon, krypton, and xenon matrices the 3D3 is the dominant ground state. Some sites occupied by atoms in the 3F4 ground state can be annealed away, but others are found to be stable to this procedure. The effects of the matrix upon the guest atoms are briefly discussed. It is interesting that only one possible case of band splitting can be identified in the spectra though the observed blue shifts are of the usual magnitude.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The optical spectra of palladium in neon and argon matrices containing up to 100% dinitrogen have been studied. Beside the known bands of isolated Pd atoms new strong bands assigned to weakly bonded Pd(N2)m (m=1, 2) complexes appear. The bands are attributed to three different types of transition. The dominant lines are essentially due to transitions localized at the Pd atom but strongly perturbed by a "crystal field'' due to the weakly bonded N2 molecules. Secondly, a vibrational progression at lower energies is assigned to a Pd to N2 charge transfer transition and thirdly, at high energies, a vibrational progression assigned to a locally excited state of an N2 molecule perturbed by weak bonding to Pd is observed. No evidence has been found for the presence of Pd(N2)3. Photoelectron spectra of the Pd(N2)m complexes in neon have been observed. The Pd 4d photoemission peak is shifted with respect to the Pd atom in Ne by ∼1.1 eV to higher binding energies.
    Type of Medium: Electronic Resource
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