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A novel and universal interference structure is found in the photoelectronmomentum distribution of atoms in intense infrared laser field. Theoreticalanalysis shows that this structure can be attributed to a new form ofCoulomb-field-driven backward-scattering of photoelectrons in the directionperpendicular to the laser field, in contrast to the conventional rescatteringalong the laser polarization direction. This transverse backward-scatteringprocess is closely related to a family of photoelectrons initially ionizedwithin a time interval of less than 200 attosecond around the crest of thelaser electric field. Those electrons, acquiring near-zero return energy in thelaser field, will be pulled back solely by the ionic Coulomb field andbackscattered in the transverse direction. Moreover, this rescattering processmainly occurs at the first or the second return times, giving rise to differentphases of the photoelectrons. The interference between these photoelectronsleads to unique curved interference fringes which are observable for mostcurrent intense field experiments, opening a new way to record the electrondynamics in atoms and molecules on a time scale much shorter than an opticalcycle.

Attosecond Interference Induced by Coulomb-Field-Driven Transverse Backward-Scattering Electron Wave-Packets