Electron-transfer cross sections to low-lying excited states of hydrogen in collisions of protons with helium and argon Back to all publications Publication date 1 January 1978 Reference J.S. Risley, F.J. de Heer and C.B.W. Kerkdijk, Electron-transfer cross sections to low-lying excited states of hydrogen in collisions of protons with helium and argon, J. Phys. B: At., Mol. Opt. Phys. 11, 1759-1781 (1978)