Abstract
We generalize the one-electron attosecond streak camera to time-resolve the correlated two-electron escape dynamics during a collision process involving a deep core electron. The collision process is triggered by an extreme ultraviolet (XUV) attosecond pulse (single-photon absorption) and probed by a weak infrared field. The principle of our two-electron streak camera is that by placing the maximum of the vector potential of the probing field at the time of collision, we get the maximum splitting of the inter-electronic angle of escape. We thereby determine the time of collision.
Highlights
We generalize the attosecond streak camera [5] to two escaping electrons
We formulate the concept for time-resolving the correlated electron dynamics in the knockout mechanism [6] with the primary electron knocking out the secondary electron in a (e, 2e)-like process
In the one-electron streak camera [3]–[5], [7]–[9], the asymptotic electron momentum is modified by the instantaneous laser field at the time the electron is ‘born’ into the continuum
Summary
We generalize the attosecond streak camera [5] to two escaping electrons. we formulate the concept for time-resolving the correlated electron dynamics in the knockout mechanism [6] (sometimes called ‘two-step-one’) with the primary electron knocking out the secondary electron in a (e, 2e)-like process. The same scheme could time-resolve, for instance, the collision between 1s and 2s electrons in the ground state of Li. The probing in our two-electron streak camera is achieved by the presence of a weak optical field during the XUV absorption, with both pulses polarized in the same direction. (In the following, photo-electron refers to the electron that initially absorbs the XUV photon.) We measure the phase of the probing field with respect to the time the XUV attosecond pulse is applied.
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