期刊
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
卷 195, 期 -, 页码 653-666出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1387-3806(99)00182-7
关键词
niobium clusters; metal clusters; metal ions; photoelectron spectroscopy
The 488 nm negative ion photoelectron spectrum of Nb-8, obtained at an instrumental resolution of similar to 5 meV, displays a clear vibrational progression in a mode with a frequency of 180 +/- 15 cm(-1) in neutral Nb-8 and 165 +/- 20 cm(-1) in Nb-8(-). The normal mode displacement of 0.4 +/- 0.1 u(1/2) Angstrom indicates a very small geometry change upon electron detachment. The electron affinity of Nb-8 is 1.513 +/- 0.008 eV. These results are discussed in light of previous negative ion photoelectron spectroscopic and density functional studies of Nb-8 and Nb-8(-). (C) 2000 Elsevier Science B.V.
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