COINCIDENCE STUDY OF ELECTRON-TRANSFER TO THE CONTINUUM PROCESS IN H-0-]AR COLLISIONS AT INTERMEDIATE ENERGIES

Energy distributions of electrons ejected into the forward direction i n 15-214 keV H-0 --> Ar collisions were measured in coincidence with c harge-stale analysed outgoing projectiles. All spectra show a cusp-sha ped peak centred at an electron velocity equal to that of the projecti le. The peaks observed in coincidence with H+ are associated with the electron-projectile Coulomb final-state interaction. On the other hand , the physical origin of the cusp-like structure observed in coinciden ce with neutral H-0 outgoing projectiles is still unknown. Here we pre sent some new evidence that seems to indicate that this peak can be at tributed to the dipole interaction between the emitted electron and an excited state of the outgoing H-0 projectile. The fractions of the cu sp yields show that the electron transfer into the continuum process a ssociated with emerging H-0 becomes more important for decreasing proj ectile energies.