Calculation of electron induced ionization cross sections of fusion plasma relevant material: W atoms G. Purohit, D. Kato, I. Murakami, Shivani Gupta and P. Sinha Eur. Phys. J. D, 75 1 (2021) 9 Published online: 12 January 2021 DOI: 10.1140/epjd/s10053-020-00030-2