Electron impact excitation of Na-like Cu XIX using the Breit–Pauli R-matrix method

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.