J. Phys. IV France 7 (1997) C2-143-C2-144
Theory of Debye-Waller and Franck-Condon Factors in EXAFST. Fujikawa
Faculty of Science, Chiba University, Inage-ku, Chiba 263, Japan
The effect of atomic displacement on EXAFS aller core hole production is studied within the harmonic approximation for atomic vibration and single scattering approximation. With aid of Schwinger method we obtain the widely used Debyc-Wallcr factor, the Condon factor and their interference term. T he second term gives the damping of EXAFS oscillation and energy shift of inner potential, and the interference term gives rise to a phase factor as linear function of photoelectron momentum k. The lifetime effect is also studied here.
© EDP Sciences 1997