Symmetry of Cl2-resonant states formed in dissociative electron attachment reaction on Cl2

The authors have studied Cl - formation by dissociative electron attachment on Cl 2 , by means of a crossed-beam electron impact spectrometer, in the energy range 0-10 eV. It is shown that the Cl - current exhibits three peaks at zero, 2.5 and around 5.5 eV. An analysis of the measured angular distributions of the Cl - ions, using the O'Malley-Taylor theory (1968) in the PRS-PS approximation, indicates that in the energy range of these peaks Cl - formation proceeds via the 2 Sigma u + , 2 Pi g and 2 Pi u Cl 2 - resonant states respectively. Furthermore the authors' results do not exclude a small contribution of the 2 Sigma g + Cl 2 - state to Cl - formation in the low-energy side of the third process.