Electron-impact cross sections of X2CO (X = H, F, Cl, Br) from ionization threshold to 5 keV Anand Bharadvaja, Savinder Kaur and K.L. Baluja Eur. Phys. J. D, 73 9 (2019) 199 Published online: 10 September 2019 DOI: 10.1140/epjd/e2019-100142-x