Extracting the magic numbers of water clusters from abundance spectra K.Hansen, Dept. of Physics, Göteborg University P.Andersson, Dept. of Chemistry,

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Presentation transcript:

Extracting the magic numbers of water clusters from abundance spectra K.Hansen, Dept. of Physics, Göteborg University P.Andersson, Dept. of Chemistry, Atmospheric Science, Göteborg University E.Uggerud, Dept. of Chemistry, Universitetet i Oslo

Pure water clusters H + (H 2 O) n N=21 (it is ”magic”)

Electrospray source & TOF-MS Ion product determination Ion production (Quadrupole mass filter, off) (TOF-MS) (collision cell, empty) Transit time defines cooling time

abundances / smoothened abundance distribution evaporative activation energies smoothened ditto heat capacity/k B evaporative rate constant frequency factor Evaporative ensemble abundances:

J.Borggreen et al., Phys.Rev. A 62 (2000) Example 1: Na cluster separation energies compared with heat bath evaporation

L. Schweikhard et al. Eur.Phys.J.D 36 (2005) 179 Example 2: Gold clusters in Penning trap compared with modelfree data

Conclusions: ’Magic’ appearance of N=21 is due both to enhanced stability of 21 and reduced stability of 22. N=28, 55 appear magic because 29, 56 are anti-magic Need to understand better: Thermal properties Radiative heating

Z.Shi et al., JCP 99 (1993) 8009 Metastable fragmentation

Radiative heating Th.Schindler et al., CPL 250 (1996) 301

Z.Shi et al., JCP 99 (1993) 8009