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  • 1985-1989  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Threshold level laser photoablation of crystalline silver: Ejected ion translational energy distributions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2616-2626 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have conducted an experiment which measures, for a single laser shot, the ejected mass and nascent velocity distributions of ionic species ablated at laser fluences near the threshold for ion production. Our results show that for a crystalline silver target, the laser-ablated ion products are ejected with fixed kinetic energy equal to 9±1 eV (3 eV FWHM). The kinetic energy of the ejecta (Ag+,Ag+2, adsorbed Fe+) do not vary with wavelength (351 and 248 nm), nor with the ion product mass, and within limits are independent of the incident laser intensity. We do see a wavelength dependence in the threshold for ion production and in the dimer/monomer (Ag+/Ag+2) ion ratio. A number of possible mechanisms are presented to explain the data, although none is without some objection. Among these, the process whereby desorption is induced by electronic transitions (DIET processes) has some merit in explaining our data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456970
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrational relaxation and electronic quenching rate coefficients for BiF(A0+,v') by SF6 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4450-4451 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have extended our kinetic data base for the A state of BiF to include SF6 as a collision partner. By applying a four level finite difference fitting routine to time-resolved fluorescence traces from v'=0–3, we have obtained rate coefficients for electronic quenching, and for vibrational relaxation within the A-state manifold. As was the case for our previous results in He and Ar, electronic quenching is slow in comparison to radiative decay. Vibrational relaxation does not show a simple v' dependence, but rather, for the levels examined, increases markedly for higher v'. Our results confirm the suitability of SF6 as a bulk diluent in the proposed NF/BiF chemical laser system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455701
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Collision-induced IR absorption in gas phase Hg(6 3P1)+HgBr2(1 1Σ+g) reactions: Enhancement of the HgBr(B 2Σ+) product channel (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 3334-3339 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have investigated laser-assisted reactions in Hg/HgBr2 gas mixtures by measuring fluorescence from the product, HgBr radical, following simultaneous IR (1064 nm) and UV (253.7 nm) laser excitation. The product emission has one-photon dependence on both IR and UV laser power, and the results indicate that the excited HgBr product channel is accessed through single photon absorptions by the {Hg–HgBr2} complex. This constitutes the first experimental evidence for an electronically excited state of the {Hg–HgBr2} collision complex, having an energy level 〉4.9 eV but 〈6.1 eV. With the addition of tunable IR lasers this technique could provide an important spectroscopic method for investigation of the homologous series of collision complexes, {Hg–HgX2} where (X=F, Cl, Br, I).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449194
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    BiF(A0+, v') radiative lifetimes and rate coefficients for V↔T transfer and electronic quenching (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 2137-2142 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The radiative lifetime for several vibrational states (v'=0–3) was measured for electronically excited BiF(A0+). The measured radiative lifetime is 1.4 μs and does not vary for the v' levels investigated. Also measured for those v' levels are the electronic quenching and V–T rate coefficients for the rare gases He and Ar at an experimental temperature of ∼485 K. The results indicate Ar is slightly more efficient in electronic quenching than is He. For both gases the quenching rate constants increases with v', with these rates becoming competitive with the radiative decay rate only for pressures in excess of 40 Torr. The vibrational relaxation (V–T) rate constant for all levels studied are found to be at least an order of magnitude greater than those for electronic quenching. The reported V–T rate coefficients scale as V1.7 for both He and Ar for v'=0, to v'=3, a result which is contrary to the behavior predicted by the classical harmonic oscillator model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450374
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    Paper (German National Licenses)
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