Controlling quantum wave packet of electronic motion on field‐dressed Coulomb potential of by carrier‐envelope phase‐dependent strong field laser pulses

Abstract

AbstractSolving numerically a non‐Born‐Oppenheimer time‐dependent Schrödinger equation to study the dynamics of H2 subjected to strong field six‐cycle laser pulses ( W/cm2, nm) leads to the newly ultrafast electron imaging in the dissociative‐ionization of . This includes the electron distribution in oscillates symmetrically with laser cycle with periodicity where the distribution concentrates between two protons for about 8 fs, being trapped in a Coulomb potential well. Nonetheless, the most important finding reveals that the electron symmetrical distribution begins to break up in the field‐free region after 24 fs when the internuclear distance stretches larger than 9 a.u. It is a result of the distortion of Coulomb potential where the ejected electron preferentially localizes in one of the double‐well potential separated by the inner Coulomb potential barrier, leading to the new images of charge resonance enhanced ionization. Controlling laser carrier‐envelope phase enables one to quantify such phenomena with the highest total asymmetries of 0.75 and −0.75 occur at and , respectively, associated with the electron preferential directionality being ionized to the right and the left paths along the molecular axis.