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PACS. 34.50H. -Electronic excitation and ionization (including beam-foil excitation and ionization). PACS. 34.80D -Atomic excitation and ionization by electron impact. PACS. 32.80H -Auger effect and innemhell ionization.Abstract. -We report measurements of the electron energy spectrum resulting from collisional ionization processes in an effusive Ba beam resonantly excited by a CW laser. We discuss the different Ba excited states contributing to ionization.