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We study ionization of atoms in strong elliptically-polarized laser fields.We focus on the physical origin of the offset angle in the photoelectronmomentum distribution and its possible relation to a specific time. Bydeveloping a model which is based on strong-field approximation and considersthe classical Coulomb scattering, we are able to quantitatively explain recentattoclock experiments in a wide region of laser and atomic parameters. Theoffset angle can be understood as arising from the scattering of the electronby the ionic potential when the electron exits the laser-Coulomb-formed barrierthrough tunneling. The scattering time is manifested as the Coulomb-inducedionization time lag and is encoded in the offset angle.

Coulomb scattering inducing time lag in strong-field tunneling ionization