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  • 1
    Electronic Resource
    Electronic Resource
    Spectroscopy of the 1 2Πu state of Na+2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4030-4038 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report here the first experimental observation of bound–bound transitions between the ground X 2Σ+g and excited 1 2Πu states of Na+2. The basis of our experiment is to study doubly excited Rydberg states of Na2 by preparing a well-defined nd 1Λg singly excited Rydberg state of Na2 and then, by exciting the Na+2 core with a tunable laser. In this paper, we show that the ionic transitions may be directly deduced from the doubly excited Rydberg states spectra [C. Bordas, J. L. Vialle, and M. Broyer (submitted)]. We demonstrate that this technique is one of the most powerful to study the excited states of diatomic ions which are not predissociated. A detailed spectroscopic analysis of the 1 2Πu state has been performed and the results are compared with the more recent ab initio and pseudo- (or model-) potential calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457816
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of the lifetime of metastable triatomic hydrogen (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 6303-6309 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We measured the survival probability of the metastable (N=0, K=0) level of the 2p2A‘2 of H3 as a function of time elapsed from formation of the molecule by probing its population with photoionization. We find lifetimes τ=640+300−100 ns for the ground vibrational state and τ=740+300−100 ns for the symmetric stretch-excited level. Equally short lifetimes are obtained from an analysis of the photoinduced bleaching of the spontaneous dissociation signal of metastable H3. These lifetimes are about 2 orders of magnitude shorter than those expected on the basis of the allowed radiative transition 2p2A‘2→2s2A'2. We attribute the faster decay channel to weakly allowed radiative transitions between the metastable state and the degenerate mode-excited repulsive ground state of H3, as well as to predissociation of the metastable levels by the repulsive ground state of H3 induced by spin–orbit coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458999
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic properties of mixed barium–oxygen clusters (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 6228-6236 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ionization potentials of BanOm clusters (2≤n≤13,m≤n) have been measured by one photon ionization. These measurements, combined with relative abundances observed in mass spectra recorded under low (direct ionization) and high (dissociative ionization) laser intensity, allow to derive general trends in the evolution of the structure and stability of barium–oxide clusters. Stoichiometric clusters (BaO)n exhibit a very fast transition toward the ionic bulk barium–oxide structure while suboxides BanOn−1 exhibit a completely different behavior. In the small size range (n〈9,m〈5), the evolution of the electronic properties does not show any regular behavior. In particular, BanO3 present very low ionization potentials while, on the opposite, the ionization potentials of BanO4 clusters are relatively high. On the other hand, beyond n≥9, the evolution of the electronic properties is rather smooth and a specific structural transition is observed when the oxygen/barium ratio increases. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481221
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  • 4
    Electronic Resource
    Electronic Resource
    Strontium clusters and ionization of the Sr"2 dimer
    Amsterdam : Elsevier
    Chemical Physics Letters 193 (1992), S. 539-545 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(92)85845-2
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  • 5
    Electronic Resource
    Electronic Resource
    Depletion spectroscopy of the Sr"2 B ^1Π"u 〈- X ^1Σ^+"g system
    Amsterdam : Elsevier
    Chemical Physics Letters 197 (1992), S. 562-567 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(92)85816-S
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  • 6
    Electronic Resource
    Electronic Resource
    Shell structure of small indium clusters below N~200 atoms
    Amsterdam : Elsevier
    Chemical Physics Letters 205 (1993), S. 13-18 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(93)85159-L
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  • 7
    Electronic Resource
    Electronic Resource
    Electronic properties and geometric structures of Li4H and Li9H from optical absorption spectra (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 2727-2736 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical absorption spectra of Li4H and Li9H clusters have been recorded by depletion spectroscopy in the visible range. From comparison with ab initio calculations, geometries of both clusters are identified. The hydrogen atom assumes a peripheral position bridging two and three Li atoms in the planar and three-dimensional structures of Li4H and Li9H, respectively. Na4F and Na9F clusters are also theoretically studied and it is shown how the strong electronegativity of the F atom leads to different geometries than in lithium hydrids. Finally, the metallic character of these clusters is discussed and in both cases, the hydrogen or fluorine atom localizes one valence electron. However, the optical absorption spectra are much broader than in pure Lin and Nan clusters due to the lower symmetry. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468649
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  • 8
    Electronic Resource
    Electronic Resource
    Photoelectron imaging spectrometry: Principle and inversion method (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 2257-2268 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new photoelectron spectrometer has recently been used to analyze the energy and spatial distribution of photoelectrons produced by multiphoton ionization of rare gases. It is based on the analysis of the image obtained by projecting the expanding electron cloud resulting from the ionization process onto a two-dimensional position sensitive detector by means of a static electric field. In this article, we present the principle of this imaging spectrometer and the relevant equations of motion of the charged particle in this device, together with an inversion method that allows us to obtain the energy and angular distribution of the electrons. We present here the inversion procedure relevant to the case where the electrostatic energy acquired in the static field is large as compared to the initial kinetic energy of the charged particles. A more general procedure relevant to any regime will be described in a following article. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147044
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  • 9
    Electronic Resource
    Electronic Resource
    MQDT analysis of rovibrational interactions and autoionization in Na"2 Rydberg states
    Amsterdam : Elsevier
    Chemical Physics 129 (1989), S. 21-39 
    Details
    ISSN: 0301-0104
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0301-0104(89)80016-3
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  • 10
    Electronic Resource
    Electronic Resource
    Shell effects in photoionization spectra of heavy trivalent metal clusters (1993)
    Springer
    The European physical journal 26 (1993), S. 137-139 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 35.20.Vf ; 33.80.Eh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser photoionization experiments have been performed on a large size range of indium and thallium clusters. The metal clusters were produced by laser vaporization technique and analyzed after laser ionization by standard time-of-flight mass spectrometry. For the indium clusters, individual ionization potentials (IP) are deduced for N≤132. Abrupt decreases in the IP values are observed, which correspond to the openings of new electronic shell as predicted by the spherical jellium model. For larger indium clusters, the unresolved mass spectra present small but reproducible oscillations. Interpretations in terms of either electronic shell structure or cluster geometry remain undecided for the moment. Our results on thallium clusters are less abundant and only qualitative. Nevertheless, they show that thallium behaves more like a monovalent element than like a trivalent one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01425643
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