Journal
PHYSICAL REVIEW A
Volume 80, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.80.053415
Keywords
electron correlations; electron impact ionisation; field ionisation; molecule-photon collisions; multiphoton processes; photoionisation; tunnelling
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Funding
- EPSRC [EPSRC/H0031771]
- NSF [NSF/0855403]
- EPSRC [EP/H003177/1] Funding Source: UKRI
- Direct For Mathematical & Physical Scien
- Division Of Physics [855403] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/H003177/1] Funding Source: researchfish
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Using a three-dimensional quasiclassical technique we explore molecular double ionization by a linearly polarized, infrared (800 nm), and ultrashort (6 fs) laser pulse. We first focus on intensities corresponding to the tunneling regime and identify the main ionization mechanisms in this regime. We devise a selection of observables, such as the correlated momenta and the sum of the momenta parallel to the laser field as a function of the interelectronic angle of escape, where all the main mechanisms have distinct traces. Second, we address intensities above but close to the over-the-barrier intensity regime. We find a surprising anticorrelation of electron momenta similar to the experimental observations reported in Phys. Rev. Lett. 101, 053001 (2008) There, however, the anticorrelation was observed in very low intensities corresponding to the multiphoton regime. We discuss the mechanism responsible for the antiparallel two-electron escape.
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