THEORY OF DYSPROSIUM L(3) XANES FREE FROM L(3) CORE LIFETIME BROADENING

The excitation spectrum of the L3M5 X-ray emission of Dy3+ system in t he pre-edge region of Dy L3 XANES is theoretically investigated based upon a coherent second order optical formula with multiplet coupling e ffect. The spectral broadening of the excitation spectrum is determine d by the M5, core hole lifetime, being free from the L3 core hole life time. The fine pre-edge structure of L3 edge due to L3N6,7 quadrupole transition can be seen in the excitation spectrum, while this structur e is invisible in the conventional XANES. The conditions for the excit ation spectrum to be regarded as the absorption spectrum with a smalle r width are discussed.