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  • 1
    Electronic Resource
    Electronic Resource
    Electronic and geometric properties of exohedral sodium- and gold-fullerenes (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 8459-8466 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electronic and geometric properties of gas-phase exohedral C60NaN−, C70NaN−, and C60AuN− cluster anions are investigated. Time-of-flight mass spectrometry and photoelectron spectroscopy (PES) reveal complex-specific arrangements of the sodium and the gold atoms on the fullerene cage. The electron affinity of C60AuN clearly shows even–odd alternation with the number of Au atoms, which suggests a "dry" structure where Au atoms aggregate as a cluster on the C60. In contrast, C60NaN and C70NaN show a "wet" structure having the Na atoms packed into stable trimers on the surface. For C60NaN (N=0 to 4), PES experiments at a high photodetachment energy (5.81 eV) allow us to deduce the net charge transferred from the sodium atoms to the lowest unoccupied molecular orbital of the fullerene. For larger C60NaN, moreover, a metallic transition is shown to occur at N∼13, and analysis of the adiabatic electron affinity variations allows the identification of the first magic sizes corresponding to electronic shell closure in the sodium layer. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1366641
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  • 2
    Electronic Resource
    Electronic Resource
    Reaction of SiC+n (n=1–6) and SiC−n (n=2–4) with O2 molecules in a radio frequency ion trap (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 9963-9967 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ion-molecule reactions of silicon-carbon binary cluster ions SiC+n (n=1–6) and SiC−n (n=2–4) with O2 molecules were studied by using an rf ion trap. For all selected positive and negative parent ions, only SiCnO+ or SiCnO− were produced, respectively. The rate constants for the oxidation of these clusters were determined for the first time. The size dependence of the reactivities are discussed, and the presence of the ring form positive ions for n=3 and 5 are suggested. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469885
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of Si growth temperature for embedding β-FeSi2 and resultant strain in β-FeSi2 on light emission from p-Si/β-FeSi2 particles/n-Si light-emitting diodes (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1804-1806 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have fabricated Si/β-FeSi2 particles/Si structures by reactive deposition epitaxy for β-FeSi2 and molecular-beam epitaxy (MBE) for Si. It was found that the photoluminescence (PL) intensity of β-FeSi2 strongly depended on MBE-Si growth temperature for embedding β-FeSi2 in Si. Room temperature 1.6 μm electroluminescence was realized from a Si-based light-emitting diode by embedding the β-FeSi2 active region with Si grown at 500 °C. Observation with transmission electron microscopy revealed that the a axis of β-FeSi2 from which PL was observed was about 9% longer than that of β-FeSi2 without PL or of bulk β-FeSi2. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1405001
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  • 4
    Electronic Resource
    Electronic Resource
    Generation and electronic properties of lanthanide–cyclooctatetraene organometallic clusters in gas phase (1999)
    Springer
    The European physical journal 9 (1999), S. 283-287 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 36.40.Mr Spectroscopy and geometrical structure of clusters – 61.46.+w Clusters, nanoparticles, and nanocrystalline materials – 71.24.+q Electronic structure of clusters and nanoparticles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Organometallic clusters of lanthanide (Ln = Nd, Er, Eu, and Yb) and 1,3,5,7-cyclooctatetraene (C8H8) were produced by a combination of laser vaporization and molecular beam methods. In the mass spectra of [Ln n (C8H8) m ], compositions of m=n+1 were magic numbers. From mass spectrometry, photoionization spectroscopy, and photoelectron spectroscopy, we have concluded that these magic-numbered clusters take multiple-decker sandwich structures in which Ln atoms and C8H8 molecules are alternatedly piled up. These sandwich clusters are formed through ionic bonds composed of multiply charged cations [Ln k+  (k=2 and 3)] and multiply charged anions [C8H8 h-  (h=1, 1.5, and 2)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010926
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  • 5
    Electronic Resource
    Electronic Resource
    Photoelectron spectroscopy of 7-azaindole–water cluster anions (1999)
    Springer
    The European physical journal 9 (1999), S. 303-307 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 82.30.Nr Association, addition, insertion, cluster formation, hydrogen bonding – 71.24.+q Electronic structure of clusters and nanoparticles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The 7-azaindole (7-AzI) cluster anions and their H2O adducts were generated by electron attachment to the 7-AzI/7-AzI–H2O clusters, and their electronic properties studied with mass spectrometry and photoelectron spectroscopy. In the mass spectra of the 7-AzI cluster anions, (7-AzI) n -, monomer anions were missing due to negative electron affinity (EA), while clusters (n≥2) have positive EA, and those having even n were more abundant than those at odd n. EA increased with cluster size from 0.88 eV at n=2, and an even–odd alternation in the EA was seen. The even–odd alternation showed that the 7-AzI dimer acts as a unit for cluster formation. In the photoelectron spectrum of (7-AzI)2 - at 266 nm, the second peak was observed 2.4 eV above the first peak; this is attributed to the triplet state of the neutral (7-AzI)2. Depending on the detachment energy, a movable peak, with the detachment of 420–300 nm (2.9–4.1 eV), was additionally observed between the first and the second peaks; this was thought to be caused by a delayed photoemission via an electronic excited state of the (7-AzI)2 - anion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050444
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