Alignment dependence of photoelectron momentum distributions for diatomic molecules N${}_2$ in strong elliptical laser fields

Abstract

We study ionization dynamics of aligned diatomic molecules N${}_2$ in strong elliptical laser fields experimentally and theoretically. The alignment dependence of photoelectron momentum distributions (PMDs) of N${}_2$ measured in experiments is highlighted with comparing to Ar measured synchronously. Our results show that the PMDs of N${}_2$ depend strongly on the alignment of the molecule, relative to the main axis of the laser ellipse. In particular, the most-probable electron-emission angle which is often used in attosecond measurement, differs remarkably when changing the molecular alignment. We show that the interplay of two-center interference and tunneling when the electron goes through the laser-Coulomb-formed barrier, plays an important role in these phenomena. Our work gives suggestions on studying ultrafast electron motion inside aligned molecules.

9 pages, 5 figures

References in corpus (6)

• Tunneling dynamics in multiphoton ionization and attoclock calibration
• Laser induced electron diffraction: a tool for molecular orbital imaging
• Above-Threshold Ionization and Laser-Induced Electron Diffraction in Diatomic Molecules
• Accurate in situ Measurement of Ellipticity Based on Sub-cycle Ionization Dynamics
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Cited by in corpus (1)

• Restricted-Geometry Quantum Models Beyond Atoms: Application of the Eckhardt-Sacha approach to NSDI in Diatomic Systems