Abstract
Strong-field ionization in the tunneling regime is achieved with small values of the Keldysh parameter (γ≪1). Here, the ionized electron wavepacket is expected to be dominantly influenced by the laser electric field rather than the Coulomb field of the parent ion. With the recent availability of intense radiation at longer wavelengths (λ ≥ 1 µm), several unexpected low-electron-energy features have been found that were not initially predicted by the well-known strong-field approximation (SFA), which is expected to be valid in this regime. These features include the low-energy structure (LES) [1], the very-low energy structure (VLES) and the zero-energy structure (ZES) [2]. Up until now only the LES has been quantitatively described. Here we present a joint experimental and theoretical study into the strong-field ionization of argon and show that each structure can be quantitatively attributed to the interplay between the laser electric field and the Coulomb field [3].
© 2015 IEEE
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