Photoassociative ionization of cold Na atoms: repulsive levels effects on the ion production rate - Paiva, R. R.; Muhammad, R.; Shiozaki, R. F.; Oliveira, A. L.; Magalhães, Daniel Varela; Ramirez-Serrano, J.; Bagnato, Vanderlei Salvador; Magalhães, Kílvia Mayre Farias (Laser Physics Letters, 2009)