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  • 36.40  (2)
  • 34.50.Lf  (1)
  • PACS: 36.40.-c Atomic and molecular clusters – 33.20.Ea Infrared spectra – 61.46.+w Clusters, nanoparticles, and nanocrystalline materials  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Reaction of Aln clusters with oxygen and ammonia (1989)
    Springer
    The European physical journal 12 (1989), S. 571-573 
    Details
    ISSN: 1434-6079
    Keywords: 82.30 ; 36.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Aluminum clusters were generated by a laser vaporization method. Ionization potential of Al2 was found to be lower than that of Al. In the reaction with oxygen at high concentration, the mixed cluster Al9O7 survives predominantly as a stable cluster. Ammonia was found to be adsorbed weakly on the Aln surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01427020
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reactivity of positively charged cobalt cluster ions with CH4, N2, H2, C2H4, and C2H2 (1991)
    Springer
    The European physical journal 19 (1991), S. 385-387 
    Details
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 34.50.Lf
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Reactivity of positively charged cobalt cluster ions (Co n + ,n=2−22), produce by laser vaporization, with various gas samples (CH4, N2, H2, C2H4, and C2H2) were systematically investigated by using a fast-flow reactor. The reactivity of Co n + with the various gas samples is qualitatively consistent with the adsorption rate of the gas to cobalt metal surfaces. Co n + highly reacts with C2H2 as characterized by the adsorption rate to metal surfaces, and it indicates no size dependence. In contrast, the reactions of Co n + with the other gas samples indicate a similar cluster size dependence; atn=4, 5, and 10−15, Co n + highly reacts. The difference can be explained by the amount of the activation energy for chemisorption reaction. Compared with neutral cobalt clusters, the size dependence is almost similar except for Co 4 + and Co 5 + . The reactivity enhancement of Co 4 + and Co 5 + indicates that the cobalt cluster ions are presumed to have an active site for chemisorption atn=4 and 5, induced by the influence of positive charge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01448334
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic spectra of solvated NH4 radicals NH4(NH3)n for n=1-6 (1999)
    Springer
    The European physical journal 9 (1999), S. 309-311 
    Details
    ISSN: 1434-6079
    Keywords: PACS: 36.40.-c Atomic and molecular clusters – 33.20.Ea Infrared spectra – 61.46.+w Clusters, nanoparticles, and nanocrystalline materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Electronic absorption spectra of NH4(NH3) n (n=1-6) were measured in the energy region of 4500–14000 cm-1. The spectra were assigned to the transition derived from a 3p 2F2-3s 2A1 Rydberg–Rydberg transition of NH4. A drastic decrease of excitation energy from the transition of NH4 (15062 cm-1) down to 5800 cm-1 for NH4(NH3)4 cluster was observed, while there was no clear difference for n=4, 5, and 6. Successive binding energies of NH4(NH3) n in the 3p-type state determined from the spectra were found to decrease monotonically with increasing n, in a similar manner to those of a positive ion, NH4 +. The drastic spectral change was ascribed to spontaneous ionization of NH4 in ammonia clusters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050445
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Collision-induced reactions of size-selected molecular cluster anions (1993)
    Springer
    The European physical journal 26 (1993), S. 223-225 
    Details
    ISSN: 1434-6079
    Keywords: 36.40 ; 34.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Collision-induced reactions of size-selected cluster anions, (CO2) n − and (N2O)nO− with He and Kr atoms were studied at collision energies from 0.1 to 2.0 eV (center-of mass) by means of a tandem mass-spectrometer equipped with a pair of octapole ion guides. The dominant process was evaporation of the constituent molecules from the parent cluster ion. The absolute cross section for the evaporation was measured as functions of the size of the parent cluster ion and the collision energy. The reaction was explained by collisional excitation of the parent cluster ion followed by its unimolecular dissociation. The observed cross sections which correspond to those for the collisional excitation agree with those calculated in terms of charge-induced dipole and induced dipole-induced dipole interactions between the parent cluster ion and the target atom. The distributions of the product ions resulting from the unimolecular dissociation were reproduced by a simple calculation based on RRK theory. In the collision of (CO2) n − , the cross sections for (CO2) 10 − and (CO2) 14 − were significantly small and their abundances in the product ion distributions were particularly large. These findings indicate that (CO2) 10 − and (CO2) 14 − are stable species. On the other hand, stable species in (N2O)nO− was found to be (N2O)5O−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01429151
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    Paper (German National Licenses)
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