Controlling quantum wave packet of electronic motion on field-dressed Coulomb potential of H2-plus-by carrier-envelope phase-dependent strong field laser pulses

• Main Author: Daud, Mohammad Noh
• Format: Article
• Published: Wiley 2021
• Subjects: QA Mathematics; QC Physics; QD Chemistry
• Online Access: http://eprints.um.edu.my/26853/

Solving numerically a non-Born-Oppenheimer time-dependent Schrodinger equation to study the dynamics of H-2 subjected to strong field six-cycle laser pulses (I=4x10(14) W/cm(2), lambda=800 nm) leads to the newly ultrafast electron imaging in the dissociative-ionization of H2+. This includes the electron distribution in H2+ oscillates symmetrically with laser cycle with theta+pi 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 H2+ 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 theta enables one to quantify such phenomena with the highest total asymmetries Aetot of 0.75 and -0.75 occur at 10 degrees and 190 degrees, respectively, associated with the electron preferential directionality being ionized to the right and the left paths along the H2+ molecular axis.