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Träfflista för sökning "WFRF:(Janssens Ewald) srt2:(2010-2014)"

Sökning: WFRF:(Janssens Ewald) > (2010-2014)

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1.
  • Bhattacharyya, Soumen, et al. (författare)
  • Mass-selected photodissociation studies of AlPbn+ clusters (n=7-16): Evidence for the extraordinary stability of AlPb10+ and AlPb12
  • 2013
  • Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121. ; 87:5
  • Tidskriftsartikel (refereegranskat)abstract
    • We report fragmentation pathways and dissociation energies of AlPbn+ (n=7–16) clusters. The clusters are produced with pulsed laser vaporization and studied in a supersonic molecular beam setup. They are mass selected and photodissociated with 532 and 355 nm laser light. Photofragments are thereafter mass separated in a tandem reflectron time-of-flight mass spectrometer. Bare Pbn+ (n = 8–16) clusters preferentially evaporate Pb atoms, with the exception of Pb15+ that fragments by loss of a Pb2 dimer to form the stable Pb13+ cluster. The smallest AlPbn+ (n = 7–11) clusters also show mainly atomic Pb evaporation, whereas the favored fragmentation pathway of the larger clusters (n = 12–16) involves Pb2 and Pb3 fragments. AlPb10+ and AlPb12+ are the most intense fragments of several larger cluster sizes, demonstrating the high stability of these two sizes. Dissociation energies corresponding to the most facile fragmentation channel of AlPbn+ (n = 11–15) are bracketed from the measured laser fluence dependencies of the fragment intensities using constraints imposed by unimolecular reaction rates. ©2013 American Physical Society
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2.
  • Hansen, Klavs, 1958, et al. (författare)
  • Thermal radiation of laser heated niobium clusters Nb_N+, 8 ≤ N ≤ 22
  • 2014
  • Ingår i: Journal of Chemical Physics. - 0021-9606 .- 1089-7690. ; 141
  • Tidskriftsartikel (refereegranskat)abstract
    • The thermal radiation from small, laser heated, positively charged niobium clusters has been measured. The emitted power was determined by the quenching effect on the metastable decay, employing two different experimental protocols. The radiative power decreases slightly with cluster size and shows no strong size-to-size variations. The magnitude is 40–50 keV/s at the timescale of several microseconds, which is the measured crossover time from evaporative to radiative cooling.
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