Politano A, Agostino R G, Colavita E, Formoso V, Chiarello G
Dipartimento di Fisica and Consorzio Nazionale Interuniversitario per le Scienze Fisiche della Materia, Università della Calabria, 1-87036 Arcavacata di Rende, CS, Italy.
J Nanosci Nanotechnol. 2009 Jun;9(6):3932-7. doi: 10.1166/jnn.2009.ns92.
The relationship between electron quantum confinement and the energy dispersion of the surface plasmon in nanoscale thin Na layers adsorbed on Cu(111) at room temperature have been studied by high resolution electron energy loss spectroscopy. Screening effects due to electron quantum confinement occurring in this system cause the lowering of the surface plasmon frequency and, moreover, make the energy range of its dispersion curve larger than in thick alkali films. Landau damping of the plasma excitation was unexpectedly very efficient at small momenta. The dispersion curve of the Na surface plasmon was found to depend on the primary electron beam energy. Multipole surface plasmon at 4.70 eV was observed only for higher impinging energies.
通过高分辨率电子能量损失谱研究了室温下吸附在Cu(111)上的纳米级薄钠层中电子量子限制与表面等离子体能量色散之间的关系。该系统中由于电子量子限制产生的屏蔽效应导致表面等离子体频率降低，此外，使其色散曲线的能量范围比厚碱金属膜中的更大。等离子体激发的朗道阻尼在小动量时出人意料地非常有效。发现钠表面等离子体的色散曲线取决于初级电子束能量。仅在较高入射能量下观察到4.70 eV的多极表面等离子体。
