期刊
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
卷 206, 期 1-2, 页码 63-78出版社
ELSEVIER
DOI: 10.1016/S1387-3806(00)00390-0
关键词
metal clusters; laser ablation; multiply negatively charged ions
Pulsed N-2-laser ablation of various metal targets (M=Au, 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 >100 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 char ed clusters, Pb-x(2-) and Au2- -commencing at threshold sizes of 35 and 29, respectively. In the case of lead, triply negatively charged clusters (Pb-x(3-), x > 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) (C) 2001 Elsevier Science B.V.
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