Covalence of Chemical Bonds and White-Line Intensity of an L3-Edge X-Ray Absorption Near-Edge Structure of Rare Earth Elements Embedded in Glass

다국어 초록 (Multilingual Abstract)

The covalence of chemical bonds of rare earth ions embedded in glasses is estimated in terms of local structural
parameters obtained from an extended X-ray absorption fine structure analysis and interpreted in connection
with L3-edge white-line intensity of the rare earth ions, which, according to some suggestions, is proportional
to the covalence. However, the Dy L3-edge white-line intensity is stronger in Dy-doped sulfide glasses, even
though the covalence of the Dy-S bonds is decreased. Moreover, the intensity variations of the Ho L3-edge
white lines in Ho-containing glasses and crystalline compounds reveal no clear correlation with the covalence
of the Ho bonds. The amorphous nature of atomic arrangements affects the multiple scattering of photoelectrons
and the local electronic density of states. These effects may need to be considered, in addition to the previously
suggested screening effect on the electronic transition, when evaluating the L3-edge white-line intensity and
optical properties of rare earth elements doped in glasses.

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