Figure 1

A sketch of the radiative capture processes viewed in the rest frame of the ion $Z_p$. (a) Radiative capture in ion-atom collisions. (b) Radiative recombination of a free electron with an ion. (c) Capture via stimulated photon emission. (d) Capture via photon absorption.Reuse & Permissions

Figure 2

Electron transfer cross sections in proton-hydrogen collisions given as a function of the impact velocity. Dashed curve: the kinematic capture; dotted curve: the radiative capture; dashed-dotted curve: the laser-induced capture; solid curve: the total capture. The parameters of the laser field are $E_0=3\text{a}\text{.u}\text{.}$ and $\omega =50\text{a}\text{.u}\text{.}$. The vector ${\mathbf{E}}_0$ is parallel to the collision velocity.Reuse & Permissions

Figure 3

Electron transfer cross sections in proton-hydrogen collisions at $v=10\text{a}\text{.u}\text{.}$ plotted versus the longitudinal component $p_{lg}$ of the target recoil ion. The cross sections are given in the reference frame where the hydrogen atom was at rest before the collision and the positive direction of the abscissa corresponds to the direction of the motion of the incident proton. The parameters of the laser field and the collision geometry are the same as in Fig. 2. The peak at $p_{lg}=-5\text{a}\text{.u}\text{.}$ corresponds to the kinematic capture. The peaks at $p_{lg}=-10\text{a}\text{.u}\text{.}$ and $p_{lg}=0\text{a}\text{.u}\text{.}$ are caused by the laser-induced electron transfer with the photon absorption and emission, respectively. All the three peaks have zero width. The radiative electron capture leads to a rather broad peak $\left(\delta p_{lg}\simeq 1\text{a}\text{.u}\text{.}\right)$ centered at $p_{lg}=0\text{a}\text{.u}\text{.}$ (not shown in the figure).Reuse & Permissions