用于二元合金团簇负离子研究的光电子能谱仪

The Anion Photoelectron Spectrometer Used in Studying Binary Metal Anion Cluster

报道了自行研制的磁瓶式飞行时间光电子能谱仪 ,它安装在自制的反射式飞行时间质谱仪的一级聚焦点的接口部位 ,将用于二元合金团簇负离子几何和电子结构的研究 .仪器测试的能量分辨好于 0 .1eV ,达到了设计指标 .对PbM-(M =Cu ,Ag ,Au)二元合金团簇负离子进行了光电子能谱的实验 ,获得的绝热电子亲合势与密度泛函的计算结果符合的很好 ,由此表明 ,该光电子能谱仪将适用于二元合金团簇负离子体系的研究 .

A home-made magnetic-bottle time-of-flight anion photoelectron spectrometer (PES) for the investigation of binary metal cluster geometry and electron structure is described. The photoelectron spectrometer is installed near the first space focus of home-made reflectron time of flight mass spectrometer (RTOFMS), coupled with laser ablation, pulse supersonic molecular carrier gas cluster source. The magnetic-bottle photoelectron spectrometer′s resolution is about 0.1 eV for 1 eV photoelectrons. The adiabatic electron affinity energies of neutral clusters and some features relative to their excited states can be obtained from the spectra, i.e., from the anion′s spectra, not only the features of the anion but also the neutral clusters′ features can be investigated. The detailed design, construction, and operation of the new apparatus are presented. And studied PbM-(M=Cu, Ag, Au) binary metal cluster anions, the results give clear diagram about their structures and the bond interactions. The adiabatic electron affinity energies obtained by the photoelectron spectrometer agree well with the calculated results using relativistic density functional theory(DFT) method. It show that this anion photoelectron spectrometer can be well used in studying binary metal cluster anions in the experiment condition.