Pontius N, Bechthold PS, Neeb M, Eberhardt W
Institut fur Festkorperforschung, Forschungszentrum Julich GmbH, D-52425 Julich, Germany.
Phys Rev Lett. 2000 Feb 7;84(6):1132-5. doi: 10.1103/PhysRevLett.84.1132.
Time-resolved two-photon photoelectron spectra have been measured for free Pt( -)(3) using femtosecond pulses of 1.5 eV photon energy in a pump-probe configuration. The time-dependent photoelectron distribution reveals a lifetime of optically excited states of less than 70 fs. Such an unexpected fast electron relaxation in Pt( -)(3) suggests the existence of inelastic electron-electron scattering processes in a triatomic cluster which result in a lifetime similar to those of bulk metals.
利用泵浦-探测配置中1.5 eV光子能量的飞秒脉冲，测量了自由Pt(-)₃的时间分辨双光子光电子能谱。随时间变化的光电子分布显示，光激发态的寿命小于70飞秒。Pt(-)₃中这种意想不到的快速电子弛豫表明，在三原子团簇中存在非弹性电子-电子散射过程，其导致的寿命与块状金属相似。
