Multipole effects in the photoionization processes of Mg isoelectronic series with Z = 12–22 Long Jiang, Gang Jiang, Hsin-Chang Chi and Keh-Ning Huang Eur. Phys. J. D, 72 1 (2018) 23 Published online: 25 January 2018 DOI: 10.1140/epjd/e2017-80652-1