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  • 1
    Electronic Resource
    Electronic Resource
    Rotational energy expressions and least-squares fitting of backbenders and similar nuclei
    Amsterdam : Elsevier
    Nuclear Physics, Section A 332 (1979), S. 82-94 
    Details
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(79)90096-4
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  • 2
    Electronic Resource
    Electronic Resource
    Energy broadening due to photoion space charge in a high resolution laser photoelectron source (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 4098-4105 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The results of experimental and theoretical studies, aiming at a quantitative characterization of photoion-induced energy broadening effects in a laser photoelectron source, are reported. The electron source is based on two-step cw laser photoionization of potassium atoms in a collimated beam. In the experimental studies, the attachment spectra for the formation of (N2O)9O− cluster ions through a narrow vibrational Feshbach resonance (full width at half maximum 2.3 meV) were measured as a function of the photocurrent. The theoretical studies involved Monte Carlo simulations of the broadening effects and were based on potential distributions caused by realistic spatial distributions of the photoions. Using the corresponding electric field distribution, trajectories were calculated for a representative ensemble of electrons, and effective electron energy distributions were obtained from averages over the electron trajectories in the volume relevant for electron attachment. Furthermore, the effects of additional weak electric fields, applied along the atomic beam direction, have been simulated. For our geometry (ionization volume about 2 mm3) the effective space charge related energy width is found to be about 16 μeV/pA. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1412861
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  • 3
    Electronic Resource
    Electronic Resource
    Kieferorthopädie und Implantologie (1994)
    Springer
    Journal of orofacial orthopedics 55 (1994), S. 261-267 
    Details
    ISSN: 1615-6714
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The therapeutical repertoire for treating patients with missing teeth was significantly expanded by the development of modern implant methods. We have performed a retrospective analysis convering all children who between 1977 and 1993 had been considered for implants as a method for gap management. All patients were pretreated up to early adolescence using standard orthodontic procedures. Unfortunately, it turned out that an originally planned implant was not suitable in approximately 2/3 of the patients because of inadequate alveolar conditions. These patients were subsequently treated by conventional orthodontic gap closure or adhesive prosthetics.
    Notes: Zusammenfassung Das therapeutische Repertoire zur Behandlung von Patienten mit fehlenden Zähnen wurde erheblich erweitert durch die Entwicklung moderner Implantationsmethoden. Wir haben die Behandlungsverläufe der Kinder, bei denen im Zeitraum von 1977 bis 1993 Implantate geplant wurden, einer retrospektiven Analyse unterzogen. Alle Patienten wurden kieferorthopädisch vorbehandelt. Leider zeigt sich, daß das ursprünglich geplante Implantat bei etwa zwei Drittel der Patienten wergen ungenügender Alveolarkammverhältnisse nicht zur Anwendung kommen konnte. Diese Patienten wurden in der Folge durch kieferorthopädischen Lückenschluß oder durch Adhäsivbrücken versorgt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02173757
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  • 4
    Electronic Resource
    Electronic Resource
    Near threshold photoionization of excited alkali atoms Ak(np) (Ak = Na, K, Rb, Cs; n = 3-6) (2000)
    Springer
    The European physical journal 10 (2000), S. 53-65 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 32.80.Fb Photoionization of atoms and ions - 33.60.-q Photoelectron spectra - 31.50.+w Excited states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The effect of the polarization of the atomic core by the outer electron on near threshold photoionization of excited alkali atoms Ak(np) (Ak = Na-Cs; n=3-6) is investigated. Partial and total cross-sections for photo-ionization of the np-electron were computed utilizing the configuration interaction technique with Pauli-Fock atomic orbitals (CIPF) and including the long range core polarization potential (CP). To calculate the core polarization potential the variational principle is applied. Comparison with previous theoretical results and with available experimental data is made for the total cross-section , for the electron angular distribution parameter , for the ratio of the reduced electric dipole matrix elements and for the phase shift difference , associated with the d-wave and s-wave continua, respectively. In the comparison, new experimental results for , , and , measured for laser-excited, polarized 39K(4p 3/2) atoms, have been included.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050526
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  • 5
    Electronic Resource
    Electronic Resource
    Vibrational Feshbach resonances in electron attachment to carbon dioxide clusters (2000)
    Springer
    The European physical journal 12 (2000), S. 125-131 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 34.80.Ht Dissociation and dissociative attachment by electron impact - 36.40.Wa Charged clusters - 34.80.Gs Molecular excitation and ionization by electron impact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Using a high resolution ( meV) laser photoelectron attachment method, we have studied the formation of (CO 2) q − ions (q = 4−22) in collisions of low energy electrons (1−180 meV) with (CO2) N ( ) clusters. The previously reported “zero energy resonance”, observed at much larger electron bandwidths, actually consists of several narrow vibrational Feshbach resonances of the type [(CO 2) N −1CO which involve a vibrationally-excited molecular constituent ( denotes vibrational mode) and a diffuse electron weakly bound to the cluster by long range forces. The resonances occur at energies below those of the vibrational excitation energies of the neutral clusters [(CO 2) N −1CO ]; the redshift rises with increasing cluster ion size q by about 12 meV per unit; these findings are recovered by a simple model calculation for the size dependent binding energies. The size distribution in the cluster anion mass spectrum, resulting from attachment of very slow electrons, mainly reflects the amount of overlap of solvation-shifted vibrational resonances with zero energy; the cluster anion size q is identical with or close to that of the attaching neutral cluster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530070049
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  • 6
    Electronic Resource
    Electronic Resource
    Formation of small water cluster anions by attachment of very slow electrons at high resolution (1999)
    Springer
    The European physical journal 7 (1999), S. 587-594 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 34.80.Lx Electron-ion recombination and electron attachment - 36.40.-c Atomic and molecular clusters - 36.40.Qv Stability and fragmentation of clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Using a high resolution laser photoelectron attachment method, we have studied the formation of (H 2 O) q - (q = 2, 6, 7, 11, 15) cluster ions in collisions of slow free electrons (E = 1-80 meV) and Rydberg electrons (n = 12-300) with water clusters. Resonances at zero energy have been observed, the shapes of which are strongly dependent on cluster size. The results are discussed in terms of the formation of metastable negative ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050385
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of solvation on dissociative electron attachment to methyl iodide clusters (2000)
    Springer
    The European physical journal 11 (2000), S. 247-256 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 34.80.Ht Dissociation and dissociative attachment by electron impact - 36.40.Qv Stability and fragmentation of clusters - 36.40.Wa Charged clusters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Using laser photoelectron attachment to methyl iodide clusters in a differentially-pumped seeded supersonic helium beam and mass spectrometric ion detection, we have measured the rate coefficients for formation of (q = 0-2) ions over the electron energy range 0-100 meV with an effective energy width of about 2.5 meV. Whereas a prominent vibrational Feshbach resonance just below the onset for the C-I stretch vibration ( ) is observed for dissociative attachment to monomers (yielding I- ions), only weak and broad structure, shifted to lower energies, is detected for formation of ions and essentially no structure is left in the attachment spectrum for . These observations are interpreted by model R-matrix calculations which successfully describe the DA cross-section for the monomer and qualitatively recover the trend observed for cluster ion formation. For the clusters, the effects of increased electron-target long-range interaction and of solvation as well as coupling to soft vibrational modes lead to strong broadening and shifting of the vibrational Feshbach resonance and, ultimately, to its disappearance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530070090
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