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Energy levels, oscillator strengths, and transition probabilities, for the 1s 2 2s 2 2p 6 , 2p 5 3l (l = 0, 1, 2), 2p 5 4l (l = 0, 1, 2, 3) states in Ni XIX and Cu XX are calculated using COWAN code. The Correlation and relativistic effects are considered. The calculations are compared with other results in the literature. A good agreement is found. We also report on some unpublished energy values.

Level structure, oscillator strengths, transition probabilities and radiative life times are evaluated for 1s 2 2s 2 2p 6 3l, 4l, 5l (l = 0, 1, 2, 3, 4) states in sodium like Co 16+ . The calculations are carried out using COWAN code. The calculations made were compared with other results in literature where a good agreement is found. We also report on some unpublished energy values and oscillator strengths. Our results are used in the calculation of reduced population of 21 fine structure levels over a wide rang of electron density values (10 18 to 10 20 ) at various electron plasma temperature. For those transitions with positive population inversion factor, the gain coefficients are evaluated and plotted against the electron density.

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