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The double ionization potentials of argon clusters

✍ Scribed by Eckart Rühl; Carola Schmale; Heike C. Schmelz; Helmut Baumgärtel

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
344 KB
Volume
191
Category
Article
ISSN
0009-2614

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✦ Synopsis

Double ionization potentials of argon clusters are measured using tunable synchrotron radiation. Small, unstable doubly charged argon cluster ions (A~ + ) are investigated with the photoion-photoion-coincidence technique. This technique is used to measure appearance potentials of dissociative double ionization reaction channels (Coulomb explosion) as a function of neutral cluster size. The threshold energies of A~ + are found to be between those of the atom and the solid. A linear relationship between threshold energies and the average cluster size is found. The results are discussed in relation to neutral cluster size distributions, single and multiple ionization of stable molecules, van der Waals clusters, and metallic clusters, as well as the energetics of cluster di-cation decay.

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