Using an improved value for the energy splitting between the $1s^{-1}3s{}^{1}S_0$ and $1s^{-1}3p{}^{1}P_1$ states, electromagnetically induced transparency for x rays at the $1s\to 3p$ resonance in Ne is reassessed. The energy splitting between the $1s^{-1}3s{}^{1}S_0$ and $1s^{-1}3p{}^{1}P_1$ states is calculated with two independent approaches. In the first approach, first-order nonrelativistic many-body perturbation theory is employed. In the second approach, the Dirac-Fock method is combined with the relativistic configuration interaction method. Both approaches give an energy splitting of $1.88\mathrm{eV}$. The calculated x-ray absorption near-edge structure of laser-dressed Ne agrees closely with an earlier prediction. It may therefore be expected that at a laser intensity of ${10}^{13}\mathrm{W}∕{\mathrm{cm}}^2$, the $1s\to 3p$ x-ray absorption cross section of Ne is suppressed by more than an order of magnitude.

• Received 19 August 2008

DOI:https://doi.org/10.1103/PhysRevA.78.065401