Research on the resonant phenomena with the inner shell excitation (resonant emission in x-ray spectra, decay of the core exciton)

通过测量卤化锂和卤化钠的光电子能谱，研究了核心激子的衰变过程。在接近核心激子激发能的光子能量处，价带谱和俄歇峰增强。提出了核心激子的两种非辐射衰变过程。根据光电子谱和吸收谱估计了这两个过程中核心激子的衰变概率。在核激子衰变过程中，发现了一些核激子的张拉现象。在NaCl和NaBr的恒初始态光谱中，由于体激子的存在，在较低的能量侧观察到额外的峰，其强度和能量位置与入射到样品上的辐射的极化密切相关，并归因于表面核激子的衰减峰。测量了Sm金属和SmB6的Sm M_<4,5>发射光谱和特征等色光谱，以及La金属的La M_<4,5>荧光发射光谱，获得了具有三维岩心孔的4f态信息。产生共振发射需要电子束能量大于共振发射能量，并且需要3d_<5/2>能级的阈值（3D<-1(1)572>4f^<n+1>-> 3D ^<10>4f^n），其中对于Sm3+离子in等于5。在La金属的M_<4,5>荧光发射光谱中观察到空穴诱导的安定过程。测量了LaB_6和CeB6的N_<4,5>发射光谱，研究了四维激发态的辐射衰减。这些光谱显示出在N_<4,5>阈值以上有强而宽的发射峰，在阈值以下有尖峰。这些峰归因于4d^94f^<n+1>激发态的辐射衰减。

The decay process of the core exciton was studied by measuring the photoelectron spectra of lithium- and sodium-halides. The valence-band spectrum as well as the Auger peak is enhanced at the photon energy close to the excitation energy of the core exciton. Two nonradiative decay processes of the core exciton were proposed. The decay probabilities of the core exciton through these two processes were estimated from the photoelectron and the absorption spectra. Some trlaxation phenomenon of the core exciton was found during the decay of the core exciton. The extra peak, whose intensity and energy position depend strongly on the polarization of the radiation incident on the sample, was observed in the constant-initial-state spectra of NaCl and NaBr on the lower energy side of the peak due to the bulk exciton and was ascribed to the decay peak of the surface-core exciton. The Sm M_<4,5> emission and characteristic isochromat spectra of Sm metal and SmB6, and the La M_<4,5> fluorescent emission spectrum of La metal were measured to obtain the informaton on the 4f state with the 3d core hole. An electron-beam energy larger than the energy of the resonant emission and also the threshold of the 3d_<5/2> level is required for the generation of the resonant emission (3D<-1(1)572>4f^<n+1>-> 3d^<10>4f^n), where in is equal to 5 for the Sm3+ion. The hole-induced shakedown process was observed in the M_<4,5> fluorescent emission spectrum of La metal. The N_<4,5> emission spectra of LaB_6 and CeB6 were measured to investigate the radiative decay of the 4d excited states. These spectra show the intense and broad emission peak above the N_<4,5> threshold in addition to the sharp peaks below the threshold. These peaks were attributed to the radiative decay of the 4d^94f^<n+1> excited states.