E- DETACHMENT FUNCTION - I - THE CLASSICAL-DYNAMIC STUDY(H)

We investigate the process e + H- --> H + 2e at low impact energies. A (quasi)classical model for the hydrogen negative ion has been used, a nd the system potential function which describes the three-body force has been employed. Using the classical trajectory method we calculate the detachment function from the (classical) threshold up to 20 eV of the impact energy. The cross section evaluated within the plane two-di mensional model follows roughly the shape of the recent experimental d ata, but appears lower than the experimental cross section close to th e threshold and lies between the latest and some of the earlier measur ed values at higher energies. The mechanism of the detachment process close to the threshold has been investigated in detail and some partic ular features of the energy, mutual angle and angular momenta distribu tions are discussed.