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We study the origin of the cusp-structure in the transverse or lateralelectron momentum distribution (TEMD) for the process of tunelling ionizationdriven by a linearly polarized laser pulse. We show that appearance of the cuspin the TEMD can be explained as follows. Projection on the set of the Coulombscattering states leads to appearance of "elementary" cusps which have simplestructure as functions of the lateral momentum. This structure is independentof the detailed dynamics of the ionization process and can be describedanalytically. These "elementary" cusps can be used to describe thecusp-structure in TEMD.

On the origin of the cusp in the transverse momentum distribution for the process of strong field ionization