Electric Nondipole Effect in Strong-Field Ionization
arXiv:2008.07638 · doi:10.1103/PhysRevLett.126.053202
Abstract
Strong-field ionization of atoms by circularly polarized femtosecond laser pulses produces a donut-shaped electron momentum distribution. Within the dipole approximation this distribution is symmetric with respect to the polarization plane. The magnetic component of the light field is known to shift this distribution forward. Here, we show that this magnetic non-dipole effect is not the only non-dipole effect in strong-field ionization. We find that an electric non-dipole effect arises that is due to the position dependence of the electric field and which can be understood in analogy to the Doppler effect. This electric non-dipole effect manifests as an increase of the radius of the donut-shaped photoelectron momentum distribution for forward-directed momenta and as a decrease of this radius for backwards-directed electrons. We present experimental data showing this fingerprint of the electric non-dipole effect and compare our findings with a classical model and quantum calculations.
arXiv comment6 pages, 3 figures
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- Controlling Magnetic and Electric Nondipole Effects with Synthesized Two Perpendicularly Propagating Laser Fields
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- Circular Dichroism in Multiphoton Ionization of Resonantly Excited Helium Ions near Channel Closing
- Relativistic analytical R-matrix (ARM) theory for strong-field ionization
- Photoelectron combs in ionization: Influence of rescattering and nondipole effects
- Nondipole photoelectron momentum shifts in strong-field ionization with mid-infrared laser pulses of long duration
- Increasing ion yield circular dichroism in femtosecond photoionisation using optimal control theory