Journal
APPLIED SURFACE SCIENCE
Volume 203, Issue -, Pages 223-227Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0169-4332(02)00631-1
Keywords
polyatomic; gold; gramicidin; LMIS; PET; SIMS
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A liquid metal ion source (LMIS) based upon a gold/germanium eutectic has been developed. The LMIS emits a variety of ions including monatomic gold and gold clusters. Gold ions have been utilised for SIMS analysis of the polypeptide gramicidin and the polymer poly(ethylene-terepthalate) (PET). It has been found that monatomic gold (Au+) increases secondary ion yields up to a factor of four compared to gallium, for both gramicidin and PET. The Au-3(+) cluster produces a strong non-linear increase in yield over monatomic gold, for both gramicidin and PET. This effect is greatest at high mass, the yield for the gramicidin molecular ion increasing by a factor of over 60. No evidence has been found to suggest increased fragmentation as a result of cluster ion bombardment. The LMIS also exhibits good static SIMS imaging capacity. (C) 2002 Elsevier Science B.V. All rights reserved.
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