Dynamic effective charge in the target continuum within the CDW-EIS model for ionisation in ion–atom collisions: angular dependenceM. F. Rojas, M. A. Quinto, R. D. Rivarola and J. M. MontiEur. Phys. J. D, 75 5 (2021) 154DOI: https://doi.org/10.1140/epjd/s10053-021-00165-w