Physics – Atomic Physics
Scientific paper
2008-06-30
Physics
Atomic Physics
12 pages, 7 figures; some discussions have been extended and some figures slightly modified
Scientific paper
10.1103/PhysRevA.78.043407
We address the influence of the orbital symmetry and of the molecular alignment with respect to the laser-field polarization on laser-induced nonsequential double ionization of diatomic molecules, in the length and velocity gauges. We work within the strong-field approximation and assume that the second electron is dislodged by electron-impact ionization, and also consider the classical limit of this model. We show that the electron-momentum distributions exhibit interference maxima and minima due to the electron emission at spatially separated centers. The interference patterns survive the integration over the transverse momenta for a small range of alignment angles, and are sharpest for parallel-aligned molecules. Due to the contributions of transverse-momentum components, these patterns become less defined as the alignment angle increases, until they disappear for perpendicular alignment. This behavior influences the shapes and the peaks of the electron momentum distributions.
Liu Xiandong
Morisson Faria Carla Figueira de
Shaaran T.
Yang Wei
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