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。当光子能量接近核心激子的激发能时，价带谱和俄歇峰都得到了增强。提出了核心激子的两个非辐射衰变过程。从光电子和吸收光谱估算了核心激子通过这两个过程的衰变几率。在核心激子的衰变过程中，发现了一些核心激子的移位现象。另外一个峰的强度和能量位置强烈地依赖于入射到样品上的辐射的偏振，由于体激子的作用，在峰的低能侧观察到了氯化钠和溴化钠的恒初始态光谱，并将其归因于表面核心激子的衰减峰。测量了Sm金属和SmB6的Sm M&lt；4，5&gt；发射光谱和特征等色谱，以及La金属La的M&lt；4，5&gt；荧光发射光谱，获得了3d芯孔的4f态的信息。产生共振发射所需要的电子束能量大于共振发射的能量，并且也需要大于3D5/2能级阈值的电子束能量(3D1(1)572；4f^；lt；n+1&gt；-3d^&lt；10；4f^n)，其中，对于Sm3+离子，In等于5。在金属La的M&lt；4，5&gt；荧光发射光谱中观察到空穴诱导安定过程。测量了LaB6和CeB6的N&lt；4，5&gt；发射光谱，研究了4d激发态的辐射衰变。这些光谱显示，除了在阈值以下的尖峰外，在N_lt；4，5&gt；阈值以上还有强烈而宽广的发射峰。这些峰归因于4d^94F^&lt；n+1&gt；激发态的辐射衰变。

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.