Abstract
The circular dichroic signal in the total cross-section for resonance-enhanced electric dipole scattering is calculated by an analytic method. Applied to lanthanide ions, our results shows that the signal is proportional to the mean value of the orbital magnetic moment, to a good approximation. This finding is the same as that found, without approximations, for the dichroic signal in the attenuation coefficient. Thus, the finding supports the use of the total fluorescence yield as a method of measuring the information known to be in the coefficient. An ion with a half-filled valence shell is shown to be an exceptional case. For the signal in the cross-section is proportional to the product of the (spin) magnetic moment and the difference between the total decay widths for the and absorption lines. For all cases, we give the angular dependence of the total cross-section, with respect to the direction of the primary radiation and the axis of quantization for the atomic states.
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