Observation of multiply charged cluster anions upon pulsed UV laser ablation of metal surfaces under high vacuum
✍ Scribed by Carsten Stoermer; Jochen Friedrich; Manfred M Kappes
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 577 KB
- Volume
- 206
- Category
- Article
- ISSN
- 1387-3806
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✦ Synopsis
Pulsed N 2 -laser ablation of various metal targets (MϭAu, Pb, Pt, Bi, Sb) in high vacuum gives rise to series of neutral as well as singly positively and negatively charged clusters. Largest clusters, ranging in size to Ͼ100 atoms, were seen for gold and lead targets. For these metals, mass spectral signal-to-noise ratio was sufficient to also observe a series of doubly negatively charged clusters, Pb x 2Ϫ and Au x 2Ϫ -commencing at threshold sizes of 35 and 29, respectively. In the case of lead, triply negatively charged clusters (Pb x 3Ϫ , x Ͼ 76) were also detected. Multianion threshold sizes result from the metastable decay of hot clusters and are associated with a size-dependent transition from evaporation (i.e., neutral atom loss) to electron autodetachment for smaller cluster sizes. (Int J Mass Spectrom 206 (2001) 63-78) © 2001 Elsevier Science B.V.