Kinematic origin for near-zero energy structures in mid-IR strong field ionization
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Date
2016
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Volume
49
Issue
10
Journal
Journal of physics : B, Atomic, Molecular and Optical Physics
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Publisher
Bristol : IOP Publ.
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Abstract
We propose and discuss a kinematic mechanism underlying the recently discovered 'near-zero energy structure' in the photoionization of atoms in strong mid-infrared laser fields, based on trajectories which revisit the ion at low velocities exactly analogous to the series responsible for low-energy structures. The different scaling of the new series, as $E\sim {I}{p}^{2}/{U}{p}$, suggests that the near-zero energy structure can be lifted to higher energies, where it can be better resolved and studied, using harder targets with higher ionization potential.
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CC BY 3.0 Unported