Metal cluster plasmons analyzed by energy-resolved photoemission

Abstract

The optical response of size-selected metal clusters is studied by wavelength-dependent photoemission and energy-resolved photoelectron detection.

Photodestruction Action Spectroscopy of Silver Cluster Anions, AgN– (N = 3–19), with a Linear Ion Trap: Observation of Bound Excited States above the Photodetachment Threshold

“…The optimized structures of Ag N − , presented as insets in Figure 1, were found to be identical to the most stable geometries reported by Yin et al, 12 except for N = 17, which will be discussed in Section 3. 4. While photoelectron spectra are often used as references for exploring structures of metal cluster anions, the present study provides an alternative approach to structure assignment via measurements and calculations of photodestruction spectra.…”

“…in the spectral profiles from Ag 7 − to Ag 10 − reflects the structural evolution in geometry, as will be discussed in Section 3. 4.…”

“…The spectral profiles observed for other sizes also exhibited a resonance-like band embedded in the continuum, for which the authors claimed that collective electron excitations emerge in such small sizes. Very recently, such a spectrum has been measured by detecting photoelectrons, as demonstrated for Ag 91 – in the photon energy range above its VDE . As for other metal cluster anions, Reiners and Haberland obtained a photoabsorption spectrum of Na 91 – , where the authors found a giant resonance at 2.65 eV and further revealed a photon energy-dependent branching ratio of the two decay channels: electron detachment and bond dissociation.…”

“…Very recently, such a spectrum has been measured by detecting photoelectrons, as demonstrated for Ag 91 − in the photon energy range above its VDE. 4 As for other metal cluster anions, Reiners and Haberland 5 obtained a photoabsorption spectrum of Na 91 − , where the authors found a giant resonance at 2.65 the two decay channels: electron detachment and bond dissociation.…”

Localized surface plasmon resonances of size-selected large silver nanoclusters (n = 70–100) soft-landed on a C60 organic substrate

“…13 Conversely, LSPR responses have been observed in the gas phase even in countable nano-sized regions containing a few to a few hundred atoms, corresponding to nanoclusters (NCs) with diameters below a few nanometers. [14][15][16][17][18][19] These findings have spurred research into constructing a theoretical framework based on quantum theory calculations, to enhance our understanding of the optical responses in these NC regions. [20][21][22][23][24][25][26][27][28][29] Regarding the threshold size for LSPR optical response in a NC, the LSPR response of Ag n NCs emerges at around 9 atoms when fabricating size-selectively monodispersed Ag n NCs on a C 60 organic substrate.…”