Bimetallic silver-gold clusters by matrix-assisted laser desorption/ionization

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Pure gold clusters (Au n +) were produced up to the cluster size of n = 100 by matrix-assisted laser desorption/ionization (MALDI). The mass spectrum of the resulting clusters showed alteration in the ion intensity at odd-even clusters size. On the other hand, intensity drops at cluster size predicted by the jellium model theory was also observed. Positively and negatively charged bimetallic silver-gold clusters were produced under MALDI conditions from the mixture of HAuCl 4/silver trifluoroacetate and the 2-(4-hydroxyphenylazo)benzoic acid (HABA) matrix. A linear correlation was found between the intensity ratio of Au nAg m + to Au n+1Ag m-1 + cluster ions and the molar ratio of the gold to silver salt. It was observed that the composition and the distribution of the clusters can be varied with the molar ratio of the silver and gold salts. It was also found that the resulting cluster sizes obey the lognormal distribution.

Original languageEnglish
Pages (from-to)1455-1461
Number of pages7
JournalJournal of the American Society for Mass Spectrometry
Issue number10
Publication statusPublished - Oct 1 2004

ASJC Scopus subject areas

  • Structural Biology
  • Spectroscopy

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