Modelling of the Ni-like and Co-like line emission from Ni-like Silver X-ray laser media

Abstract

We have modelled the Ni-like and Co-like resonance lines emitted from Ni-like Silver X-ray laser media using a collisional radiative code. The code calculates intensities of Ni-like 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 → 1s 2 2s 2 2p 6 3s 2 3p 6 3d 9 nl. Co-like 1s 2 2s 2 2p 6 3s 2 3p 6 3d 9 → 1s 2 2s 2 2p 6 3s 2 3p 6 3d 8 n resonance lines emitted from silver. Intensities of photons emitted between Ni-like 1s 2 2s 2 2p 6 3s 2 3p 6 3d 9 n'l' → 1s 2 2s 2 2p 6 3s 2 3p 6 3d 9 nl and Co-like 1s 2 2s 2 2p 6 3s 2 3p 6 3d 8 n'l' → 1s 2 2s 2 2p 6 3s 2 3p 6 3d 8 nl excited levels are also calculated. The optimum electron temperature and density for J = 0 - 1 lasing at 13.9 nm is evaluated. The ratios of Co-like 3d-4p to Ni-like 3d 4p resonance lines are calculated with the aim that such ratios can serve as a diagnostic to measure electron temperatures.