Manipulation of resonant Auger processes with strong optical fields*

We recently reported on the optical control of core-excited states of a resonant Auger process in neon [1]. We have focused on the resonant excitation $1s\!\rightarrow\!1s^{-1}3p$, while a strong optical field may resonantly couple two core-excited states ($1s^{-1}3p$ and $1s^{-1}3s$) in the Rydberg manifold as well as dressing the continuum. There is a clear signature in the Auger electron spectrum of the inner-shell dynamics induced by the strong optical field: i) the Auger electron spectrum is modified by the rapid optical-induced population transfer from the $1s^{-1}3p$ state to the $1s^{-1}3s$ state during their decay. ii) The angular anisotropy parameter, defining the angular distribution of the Auger electron, is manifested in the envelope of the (angle-integrated) sidebands.\\[4pt] [1] A. Pic\'on {\em et al.}, Phys. Rev. A, in press.