Phys. Rev. Lett. 102, 156802 (2009) [4 pages]Photoabsorption by Volume Plasmons in Metal NanoclustersReceived 21 December 2008; revised 24 March 2009; published 17 April 2009 It is well known that plasmons in bulk metals cannot be excited by direct photoabsorption, that is, by coupling of volume plasmons to light. Here we demonstrate that the situation in nanoclusters of the same metals is entirely different. We have carried out a photodepletion measurement for Na20 and Na92 and identified a broad volume plasmon absorption peak centered slightly above 4 eV, revealing the possibility of optical excitation of volume-type collective electronic modes in a metallic system. The observed phenomenon is related to different selection rules for finite systems. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.156802
DOI:
10.1103/PhysRevLett.102.156802
PACS:
73.22.Lp, 36.40.Gk, 36.40.Vz, 71.45.Gm
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