期刊
PHYSICAL REVIEW LETTERS
卷 86, 期 14, 页码 2992-2995出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2992
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The florescence of Ag-8 in an argon matrix and in argon droplets is reported. This is the first unambiguous assignment of the fluorescence of a metal cluster larger than the tetramer, indicating that the excited state lifetime is longer than previously thought. It is discussed as a possible result of a matrix cage effect. The excitation spectrum is compared with two-photon-ionization measurements of Ag-8 in helium droplets and to known absorption data. The agreement is excellent. We propose that the excited states relax rapidly through vibrational coupling to a long-lived state, from which the fluorescence occurs.
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