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Level structure, oscillator strengths, transition probabilities and radiative life times are evaluated for 1s2 2s2 2p<st1:chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="63" unitname="l" w:st="on">63l</st1:chmetcnv>, <st1:chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="4" unitname="l" w:st="on">4l</st1:chmetcnv>, <st1:chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="5" unitname="l" w:st="on">5l</st1:chmetcnv> (l = 0, 1, 2, 3, 4) states in sodium like Cu18+. The calculations are carried out using COWAN code. The calculations were made are compared with other results in literature where a good agreement is found, we also report on some unpublished energy values and oscillator strengths.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 (1018 to 1020) and at various electron plasma temperature. For those transitions with positive population inversion factor, the gain coefficients are evaluated and plotted against the electron density.

The Gain Distribution According to the Theoretical Structure and Decay Dynamics of Sodium like Cu