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Radiative transition probabilities (A values) are computed for the Fe xvii L-shell lines in a Breit-Pauli configuration-interaction method with the autostructure atomic structure code. It is shown that, by carefully taking into account the fine-tuning of the relativistic coupling and 2p-orbital relaxation, the measured A values of the M1 and M2 lines and, for the first time, the low f(3C)/f(3D) oscillator-strength ratio are satisfactorily reproduced by the theory. The present ratio f(3C)/f(3D)=2.82 compares well with the measurement of 2.61±0.23 by x-ray laser spectroscopy.

physical review letters

Theoretical Confirmation of the Low Experimental<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>3</mml:mn><mml:mi>C</mml:mi><mml:mo>/</mml:mo><mml:mn>3</mml:mn><mml:mi>D</mml:mi></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>f</mml:mi></mml:mrow></mml:math>-Value Ratio in Fe xvii

Theoretical Confirmation of the Low Experimental3C/3Df-Value Ratio in Fe xvii