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Electron impact excitation collision strengths for the transitions among the lowest twelve fine structure levels belonging to $$2\hbox {p}^{\mathrm {6}}\hbox {nl }$$ ( $$\hbox {\textit{n}}=3,4,\hbox {\textit{l}}=0-3$$ ) configurations of Cu XIX ion are presented using the close-coupling Breit–Pauli R-matrix method. Target state wavefunctions have been constructed using the AUTOSTRUCTURE. The collision strengths are also tabulated at selected energies above the excitation thresholds in the range 50–300 Ryd. For assessing the accuracy and reliability of our collision strength values, an independent calculation has been carried out using the relativistic distorted wave method. The effective collision strengths are obtained over a wide electron temperature range of $$1.0\times 10^{\mathrm {5}} - 4.0\times 10^{\mathrm {7}}$$ K by averaging over a Maxwellian distribution of velocities. We believe that our present results will be beneficial in the modelling of astrophysical and fusion plasmas.

The total photoionization cross sections for the ground state 2p63s2(1S0) and the lowest three excited states 2p63s3p(3Po0,1,2) of the Mg-like Cu XVIII ion have been calculated by making use of the close-coupling Breit Pauli R-matrix (BPRM) approximation. The lowest 21 target level states of Cu XIX have been included in the photoionization calculations of Cu XVIII. Our calculated target state energies of the core ion Cu XIX show a good agreement with the observed energies tabulated in the NIST database. To further assess the accuracy of our BPRM results, photoionization cross section calculations for the ground state configuration have also been performed by employing the fully relativistic Dirac atomic R-matrix code (DARC). Our two independent calculations show a reasonable agreement between the calculated cross sections in the overall background shape and magnitude. We believe that our cross section data may be beneficial for the modelling and diagnostics of astrophysical and laboratory plasmas.