Structure associated with autoionization transitions in the He atom

<p><strong>Figure 6.</strong> Structure associated with autoionization transitions in the He atom. Arrows indicate positions of lines at the ion scattering angle θ<em><sub>i</sub></em> = 0° relevant to decay of the states 2s<sup>2 1</sup>S(1), 2p<sup>2 1</sup>D(2), 2s2p <sup>1</sup>P(3) and 2p<sup>2 1</sup>S. The broken line is the spectral line for the state 2s<sup>2 1</sup>S, calculated at θ<em><sub>i</sub></em> = 2° and normalized at the peak maximum. Ion energy is 12 keV.</p> <p><strong>Abstract</strong></p> <p>Energy spectra of electrons ejected into <sup>3</sup>He<sup>2+</sup>–H<sub>2</sub> collisions have been measured in the incident ion energy range 6–30 keV. Parameters of the quasimolecule formed during the collision are determined. The dominant role of the channel (2a')<sup>2</sup> → 1a'3a' → 1a' + <em>e</em> in the production of electrons at keV ion energies has been revealed. The structure associated with autoionization transitions in the projectile helium atoms shows enormously large broadening and shift to lower energies.</p>