TITLE

Extraction of C60 cluster ion beam

AUTHOR(S)
Chuanchen, Sun; Haibin, Gao; Dufei, Fang
PUB. DATE
April 1994
SOURCE
Review of Scientific Instruments;Apr94, Vol. 65 Issue 4, p1405
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A C[sup +, sub 60] ion beam was extracted from a hollow cathode ion source (model 911A). The mass. spectra of 6 kev C[sub 60] and its fragments have been measured. Only those clusters with an even number of C atoms were observed and the largest one was C[sub 84]. The result shows that the fragment ion beam has an exponential distribution, which is similar to that of C[sup +, sub 60]-H[sub 2](He) collision experiments. We also have extracted C-cluster negative-ion beams from a Middleton 860 sputtering source. With a graphite cathode, we have observed many cluster ions which were not previously reported. For a C[sub 60]/C[sub 70] cathode, we have obtained a stable C[sup -, sub 60] ion beam with current of about 1 nA. The spectra of the negative ions are complicated due to the existence of the Cs-C[sub n] clusters.
ACCESSION #
9781002

 

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