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Controlling quantum wave packet of electronic motion on field‐dressed Coulomb potential of H 2 + by carrier‐envelope phase‐dependent strong field laser pulses
Author(s) -
Daud Mohammad Noh
Publication year - 2021
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.26783
Subject(s) - wave packet , carrier envelope phase , physics , electron , atomic physics , electric field , ionization , laser , coulomb , envelope (radar) , field (mathematics) , schrödinger equation , chemistry , quantum mechanics , ion , telecommunications , radar , mathematics , computer science , pure mathematics
Solving numerically a non‐Born‐Oppenheimer time‐dependent Schrödinger equation to study the dynamics of H 2 subjected to strong field six‐cycle laser pulses ( I = 4 × 10 14 W/cm 2 , λ = 800 nm) leads to the newly ultrafast electron imaging in the dissociative‐ionization of H 2 + . This includes the electron distribution in H 2 + oscillates symmetrically with laser cycle with ϑ + π 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 H 2 + 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 ϑ enables one to quantify such phenomena with the highest total asymmetries A e tot of 0.75 and −0.75 occur at 10 ° and 190 ° , respectively, associated with the electron preferential directionality being ionized to the right and the left paths along the H 2 + molecular axis.