Journal
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volume 106, Issue 2-3, Pages 107-116Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0368-2048(99)00069-9
Keywords
anion photoelectron spectroscopy; femtosecond spectroscopy; multiphoton emission; mass selected transition metal clusters
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Photoelectron spectra have been measured for small Pt(n)(-) and Pd(n)(-) clusters (n=1-7) by using femtosecond single laser pulses of 3 eV and 1.5 eV photon energy, respectively. The spectra reveal multi-photon processes which result in a continuously distributed electron signal at binding energies below the electron affinity of the clusters. The intensity of the multi-photon electron signal normalized to the one-photon signal in the spectra recorded with 3 eV increases Linearly with the laser peak power indicating a second order process. Using 1.5 eV photons, photoelectrons from two-, three- and four-photon processes have been observed for Pt(3)(-). (C) 2000 Elsevier Science BN. All rights reserved.
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