Resonant Transfer and Excitation Associated with Two-Photon Emission

Abstract

In collisions of highly charged (heavy) projectiles with target atoms electron capture may be the dominant reaction channel. For light target atoms the target electrons can be considered as quasifree and most of the capture processes can be treated within the recombination picture:

$$Z_p^{q + } + e\left( {{Z_T}} \right) = Z_p^{\left( {q - 1} \right) + } + \left( {{Z_T}} \right)$$

Only for the non-radiative or the kinematic capture, NRC, the binding of the target electrons is important for the reaction. Here, the Coulomb interaction of the projectile nucleus with a target electron leads to capture where the target nucleus is needed to fulfill energy and momentum conservation laws.