Evaporative attachment of slow electrons to alkali nanoclusters

Details Evaporative attachment of slow electrons to alkali nanoclusters Evaporative attachment of slow electrons to alkali nanoclusters

2008-01-23

arxiv.org/abs/0801.3601v2

Phys. Rev. A 77, 063202 (2008)

Physics

Atomic and Molecular Clusters

9 pages, 3 figures, revised

Scientific paper

10.1103/PhysRevA.77.063202

The abundance spectrum of Na^-_{n~7-140} anions formed by low energy electron attachment to free nanoclusters is measured to be strongly and nontrivially restructured with respect to the neutral precursor beam. This restructuring is explained in quantitative detail by a general framework of evaporative attachment: an electron is captured by the long-range polarization potential, its energy is transferred into thermal vibrations, and dissipated by evaporative cooling. The data also affirm a formulated relation between the binding energies of cationic, neutral, and anionic clusters, and an adjustment to the prior values of dimer evaporation energies.

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