Negative ion formation at a barium surface exposed to an intense positive-hydrogen ion beam Back to all publications Publication date 1 January 1988 Reference C.F.A. van Os, P.W. van Amersfoort and J.H. Los, Negative ion formation at a barium surface exposed to an intense positive-hydrogen ion beam, J. Appl. Phys. 64, 3863-3873 (1988) Request this article