PI mass spectrum of rubidium-doped He droplets. The shaded area indicates the expected position of the first shell closure as derived from Ref. 9. Mass peaks resulting from contamination with cesium or residual water vapor are represented in gray.
Differential mass spectrum of snowballs showing the relative abundances of neighboring snowball masses , . The predicted position of the first shell closure is depicted as shaded area. Missing data points are due to overlapping with mass peaks of neat alkali ions or contaminants.
PI mass spectrum of He droplets doped with cesium. The snowball progression features a distinct drop in peak height at in accordance with theoretical predictions (Ref. 9). For comparison, the same mass spectrum is recorded using electron-impact ionization (light red peaks shifted by 1 amu to higher masses).
Mass spectra displaying and snowball progressions on a logarithmic scale. Mass peaks resulting from contamination with other alkali metals or residual water are represented in gray.
Comparison of snowball abundances relative to the neat alkali ion cores for all alkali metals probed. Dashed lines are to guide the eyes. An upper limit to the abundance of snowballs larger than and is indicated by the hatched area.
PI spectra of cesium-doped He droplets recorded at the mass neat (a) cesium ions and of the snowball (b) as examples. The -spectra in (a) are recorded at monomer doping conditions (dotted line) and at doping conditions optimized for snowball formation (solid line). The positions of the atomic cesium lines are shown as stick spectrum.
Dependence of the yield of different snowballs on the amount of atoms doped into the droplets. (a) Monomer snowballs (, 3, 6, and 11). (b) Dimer snowballs (, 3, 6). The dashed lines indicate Cs densities corresponding to most efficient doping of (a) one and (b) two Cs atoms. Note the logarithmic -scale. The insets show a magnified view of the same data.
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