Ag8 fluorescence in argon

  • Félix C
  • Sieber C
  • Harbich W
 et al. 
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Abstract

The fluorescence of Ag8 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 Ag8 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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Authors

  • C. Félix

  • C. Sieber

  • W. Harbich

  • J. Buttet

  • I. Rabin

  • W. Schulze

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