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Study of Excited States of Rare Earths and Their Compounds by Means of XPS and BIS

利用XPS和BIS研究稀土及其化合物的激发态

基本信息

批准号：
63540260
负责人：
AITA Osamu
金额：
$ 1.22万
依托单位：
College of Engineering, University of Osaka Prefecture
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63540260/
关键词：
Resonance Emission Rare-Earths Soft x-ray APS 等色X線

项目摘要

The creation and the decay mechanisms of the 3d-electron excited states of rare earths and their compounds were investigated by measuring soft x-ray emission and absorption spectra, inverse photoelectron spectra (characteristic isochromat spectra), and soft x-ray excited soft x-ray appearance potential spectra (XXAPS). The results in this research project are summarized in the following.1) The rare-earth M_<4,5> emission spectra produced by electron bombardment and the M_<4,5> absorption spectra were measured for Sm metal, SmB_6, CeB_6, and NdB_6. The emission peaks observed at the same energy positions as the corresponding absorption peaks were assigned as the resonant emission peaks. Moreover, to confirm the resonant process, the XXAPS were measured for Sm metal and SmB_6 in the Sm-3d electron excitation region. Two peaks were observed in the XXAPS at the excitation photon energies equal to the energies of the prominent peaks in the Sm M_<4,5> absorption spectra. These peaks are attributed to the peaks due to the resonant process 3d^<10>4f^n <tautomer> 3d^94f^<n+1>, where n is the number of the 4f electrons in the ground state.2) The characteristic isochromat spectra at the photon energy of the resonant peak (1079 eV for Sm metal and SmB_6) show that an electron-beam energy beyond 1085 eV is required for the generation of the resonant emission. This is ascribed to the formation of the transient state 3d^94f^<n+2>.3) The resonant peak in the M4 spectral region, which was not observed separately from the diagram line M_4N_6 in the electron-excited spectra, was clearly observed in the XXAPS in addition to the resonant peak in the M_5 spectral region.

通过测量稀土及其化合物的软X射线发射和吸收光谱、反光电子能谱(特征等色谱线)和软X射线激发软X射线出现势谱(XXAPS)，研究了稀土及其化合物3d电子激发态的产生和衰变机理。1)测量了金属Sm、SmB_6、CeB_6和NdB_6的电子轰击产生的稀土M&lt；4，5&gt；发射光谱和M&lt；4，5&gt；吸收光谱，并将与相应吸收峰位于同一能量位置的发射峰指定为共振发射峰。此外，为了证实共振过程，测量了Sm金属和SmB6在Sm-3D电子激发区的XXAPS。在激发光子能量等于Sm M&lt；4，5&gt；吸收光谱中突出峰的能量时，在XXAPS中观察到两个峰。这些峰归因于共振过程产生的峰值3d^&lt；10&gt；4f^n&lt；3d^94F^&lt；n+1&gt；其中n是基态中4f电子的数目。2)共振峰光子能量处的特征等色谱(对于Sm金属和SMB_6)表明，产生共振发射需要超过1085 eV的电子束能量。3)除了M_5谱区的共振峰外，XXAPS还观察到了M4谱区的共振峰，而不是与电子激发谱中的M_4N_6谱线分开。