J. Phys. B

Granneman, E. H. A., Klewer, M., Nienhuis, G., & van der Wiel, M. J. (1977). Two-photon ionization of caesium via the 7 2P 1/2,3/2 intermediate states. J. Phys. B: At., Mol. Opt. Phys., 10, 1625–1632.