Electron emission for transfer ionization in 70 keV H+ on He

We present experimental results for doubly differential electron emission i n transfer ionization produced by H+ projectiles on a He target at 70 keV i mpact energy. Energy spectra were obtained at emission angles of theta = 0 degrees, 20 degrees and 50 degrees, and compared with spectra of total elec tron emission, these being dominated by single ionization. A cusp-shaped em ission of electrons at the velocity of the emerging H-0 projectiles, and an enhanced electron emission from binary-encounter collisions are observed i n the transfer ionization spectra.