Photoabsorption by volume plasmons in metal nanoclusters.
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 Na(20) and Na(92) 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.
Xia
Chunlei
C
Department of Physics and Astronomy, University of Southern California Los Angeles, Los Angeles, California 90089-0484, USA.
Yin
Chunrong
C
Kresin
Vitaly V
VV