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  • 1
    Electronic Resource
    Electronic Resource
    Alkaline earth metals (Ca, Sr) attached to liquid helium droplets: Inside or out? (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 10816-10818 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Superfluid helium droplets HeN at 0.4 K are doped with single alkaline earth atoms (Ca, Sr). The absorption spectra for excitation of the lowest singlet transitions display broad, blue-shifted peaks if compared to the atomic lines. The shift increases with droplet size increasing from N(approximate)1000 up to N(approximate)10000 but converges to only about one third of the bulk value. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474198
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  • 2
    Electronic Resource
    Electronic Resource
    Photoelectron investigations and density functional calculations of anionic Sbn− and Bin− clusters (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 9719-9728 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We recorded photoelectron spectra of antimony Sb−N=2–9 and of bismuth clusters Bi−N=2–9 with a photon energy of 4.03 eV, as well as of Bi−N=2–21 with a photon energy of 5.0 eV. The experimentally determined photoelectron thresholds and peak positions of Sb−N=2–5 and Bi−N=2–5 are compared with the results of ab initio density-functional (LCAO) calculations. The agreement between the experimental thresholds and the calculated adiabatic electron affinities, as well as between the first maxima in the spectra and the calculated vertical detachment energies is fair to good for the antimony clusters and qualitative for the bismuth systems. For the calculation of the ionization (detachment) energies we determined for the neutral and anionic clusters the most stable structures by LCAO calculations. In particular, the tetramer cluster anions have a "roof'' structure, while the negatively charged pentamers are planar rings [with similarities to the (C5H5)− anion]; positive and negative trimers are nonlinear. Furthermore, the ionization energies and affinities of larger antimony and bismuth clusters are discussed qualitatively and compared to jellium calculations of Seidl and Brack. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471733
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  • 3
    Electronic Resource
    Electronic Resource
    Critical evolution of hot van der Waals droplets (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 7766-7776 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The dynamical evolution and fragmentation of a hot finite van der Waals system is investigated in a classical molecular dynamics approach. It is demonstrated that, under certain conditions determined mainly by the initial deposited energy, the fragmentation of rare-atom clusters exhibit a critical behavior. This behavior leaves its signatures in the mass distributions and the conditional moments, as well as the scaled factorial moments of the produced fragments. The connection between the observed critical behavior and the second-order liquid-gas phase transition is investigated by employing Fisher's droplet model for the average fragment mass distributions, and performing Campi and intermittency analysis for the correlation and fluctuation properties of the fragment mass distributions. The size dependence of the signatures of critical behavior is discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473749
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  • 4
    Electronic Resource
    Electronic Resource
    Langmuir–Taylor surface ionization of alkali (Li, Na, K) and alkaline earth (Ca, Sr, Ba) atoms attached to helium droplets (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3480-3484 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A beam of superfluid helium droplets (HeN, N(approximate)104) doped with alkali and alkaline earth atoms is detected by Langmuir–Taylor surface ionization. We measured detection efficiencies and time constants as a function of the temperature of a hot rhenium surface. Compared to results on free K, Na, and Ba atoms we find practically no differences in the detection properties; apparently the helium host environment does not significantly influence the mechanism of surface ionization. In addition, data for Li, Ca, and Sr on detection probabilities and residence times of the ions on the hot rhenium surface will be presented for the first time. Time constants and desorption energies are extracted; for alkaline earth atoms the latter are found to be significantly higher compared to the desorption of the alkalis. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287750
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  • 5
    Electronic Resource
    Electronic Resource
    Motion of Energetic Particles in Crystals (1967)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Nuclear and Particle Science 17 (1967), S. 129-188 
    Details
    ISSN: 0066-4243
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ns.17.120167.001021
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  • 6
    Electronic Resource
    Electronic Resource
    Application of multi-channel analysis techniques to beam-foil spectroscopy of neutral cobalt in the region 3000 Å to 3950 Å (1977)
    Springer
    The European physical journal 281 (1977), S. 325-332 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new experimental arrangement is described which is designed for measuring lifetimes of levels of low ionization states of heavy elements using the beam-foil technique. The method is applied to obtain lifetimes of 14 CoI transitions in the spectral range 3000 Å to 3950 Å. Our results are found to be in excellent agreement with the lifetime of the levels which have been measured previously using dye-laser excitation. Thef-values derived from our results indicate that the temperature correction proposed by Degenkolb and Griffiths greatly improves the accuracy of the Corliss and Bozman data, and also show remarkable consistency with the semi-empirical values tabulated by Kurucz and Peytremann. Finally, our newf-values are used to obtain a cobalt photospheric abundance given by logN(Co)=4.75±0.05.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408179
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  • 7
    Electronic Resource
    Electronic Resource
    3dσ excitation in slow Ne-Ar collisions (1983)
    Springer
    The European physical journal 313 (1983), S. 281-288 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The impact parameter dependence of ArL-shell excitation in Ne-Ar collisions has been studied at collision energies of 200, 400 and 700 keV. Experimental vacancy production rates have been obtained by observing Ar-L Auger electrons in coincidence with scattered ions. A theoretical analysis of the experimental data has been performed by assuming vacancy production in the quasimolecular 3dσ orbital to be the dominant mechanism for ArL-shell excitation. Probabilities have been calculated separately for 3dσ excitation via 3dδ-3dπ-3dσ rotational coupling and via direct coupling to the continuum. The data at large impact parameters (where the calculated contribution from direct ionization is negligibly small) can be understood solely in terms of rotationally induced 3dσ excitation. The enhancement of the vacancy production rate over the rotational-coupling contribution observed for smaller impact parameters is explained qualitatively by the onset of direct 3dσ ionization. Total cross sections for Ar-L vacancy production have been determined experimentally for collision energies ranging from 70 to 700 keV, and have been analyzed also in terms of 3dσ excitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439479
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of alignment tensor components for the H(2p) charge exchange excitation in proton-argon collisions (1982)
    Springer
    The European physical journal 304 (1982), S. 63-68 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Alignment tensor components 〈T(L) KQ + 〉 have been determined for the H(2p) charge exchange excitation in proton-argon collisions at an incident proton energy of 1.5 keV, and scattering angles Θ s =4.3°, 4.9°, and 6.0°. It is demonstrated that the measured photon angular distribution cannot be described in terms of only λ and ϰ parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432276
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  • 9
    Electronic Resource
    Electronic Resource
    The application of some beam-foil measurements for Co I and Co II to the cobalt photospheric abundance (1974)
    Springer
    The European physical journal 267 (1974), S. 27-30 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mean lives of a number of energy levels in Co I and Co II have been measured. Particular attention has been paid to the energy loss incurred by the ions in the foil, which was found to be somewhat larger than the loss forecast by Lindhard's theory.A-values derived for Co I (using relativegA-values from the literature) are found to be significantly lower than those reported previously by other authors. Fair agreement is obtained for Co II with theA-values forecast by Warner. The Co IA-values indicate that the cobalt solar abundance given by Goldberget al. (LogN Co=4.64) should be increased to about 4.9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01680358
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous electron-photon excitation of hydrogen and helium (1984)
    Springer
    The European physical journal 315 (1984), S. 271-276 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Total and differential cross sections for simultaneous excitation of H(2s), H(3s) and He(1s 2s) by electron impact in the presence of a photon field have been calculated in second-order perturbation theory. The characteristics of the results are interpreted in terms of their physical origin. The off-shell excitation cross section for the He(1s 2s) state is found to be one order of magnitude smaller than that for excitation of the H(2s) state. This is consistent with our expection that atoms with higher dipole-polarisability should favour larger off-shell cross sections for transitions betweens-states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01438450
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