Evolution of the electronic properties of small Nin− (n=1–100) clusters by photoelectron spectroscopy

Journal of Chemical Physics - Tập 117 Số 21 - Trang 9758-9765 - 2002
Shurong Liu1,2, Hua‐Jin Zhai1,2, Lai-Sheng Wang1,2
1Department of Physics, Washington State University, Richland, Washington 99352
2and W. R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, MS K8-88, Richland, Washington 99352

Tóm tắt

Photoelectron spectra of size-selected and relatively cold Nin− (n=1–100) clusters were obtained at three detachment photon energies; 355, 266, and 193 nm. The evolution of the electronic structure of Nin− clusters from molecular to bulklike behavior was systematically investigated. Well-resolved threshold peaks were observed for small Nin− clusters (n⩽9), beyond which a single broadband was observed due to the high electronic density of states at large cluster sizes. This spectral change coincides with a dramatic decrease of the magnetic moment in this size range. In addition, narrow and well-resolved spectral features were observed around n=13 and 55, consistent with high symmetry icosahedral structures proposed for these clusters. A sharp threshold peak was observed in the spectra of Ni19− and Ni23−, also evident of more symmetric cluster structures. The spectra of Ni3− measured at various photon energies suggested the existence of two isomers. The electron affinities of the Nin clusters were observed to follow the prediction of a metallic droplet model at large cluster sizes above n=10 and extrapolate to the bulk work function of Ni at infinite size.

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Thông tin xuất bản

Journal of Chemical Physics

Tập 117 Số 21

9758-9765

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