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We theoretically demonstrate a one-to-one mapping between the direction ofelectron ionization and the phase delay between a linearly polarized VUV and acircular IR laser pulse. To achieve this, we use an ultrashort VUV pulse thatdefines the moment in time and space when an above threshold electron isreleased in the IR pulse. The electron can then be accelerated to highvelocities escaping in a direction completely determined by the phase delaybetween the two pulses. The dipole matrix element to transition from an initialbound state of the N$_2$ molecule, considered in this work, to the continuum isobtained using quantum mechanical techniques that involve computing accuratecontinuum molecular states. Following release of the electron in the IR pulse,we evolve classical trajectories, neglecting the Coulomb potential andaccounting for quantum interference, to compute the distribution of thedirection and magnitude of the final electron momentum. The concept wetheoretically develop can be implemented to produce nanoscale ring currentsthat generate large magnetic fields.

Mapping the direction of electron ionization to phase delay between VUV and IR laser pulses