Photoionization of Na-like Si IV using R-matrix method Nupur Verma, Alok K. S. Jha, Dishu Dawra, Mayank Dimri and Man Mohan Eur. Phys. J. D, 77 7 (2023) 134 Published online: 14 July 2023 DOI: 10.1140/epjd/s10053-023-00716-3