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Negative and positive cluster ions of carbon and silicon

✍ Scribed by L.A. Bloomfield; M.E. Geusic; R.R. Freeman; W.L. Brown

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
371 KB
Volume
121
Category
Article
ISSN
0009-2614

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✦ Synopsis

An experimental technique that produces, mass-resolves, and isolates both positive ond negarive clusier ions is described. Cluster ions of from 1 LO greater than 50 atoms have been observed in carbon and silicon. This apparatus does rwr cnnverr neural clusrcrs 10 ions via a secondary ionizing agent (e.g., laser phoroionizarion or electron-impact ionizarion), bur rather produces the cluster ions direcdy. Measurements of relaiive abundances of both posirive and negative clusters ("magic numbers") in carbon and silicon are presenied. These results are compared IO rhose obiained with conveniional neutral clusrer laser phoroionizalion methods. and LO spectra obtained using pholofragmenlation speclroswpy.

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