J. Phys. B

Risley, J. S., de Heer, F. J., & Kerkdijk, C. B. W. (1978). 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.