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Updated: Mar 22, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Dynamics of Strong-Field Double Ionization in Two-Color Counterrotating Fields
Jan L Chaloupka1, Daniel D Hickstein2
1Department of Physics and Astronomy, University of Northern Colorado, Greeley, Colorado 80639, USA.
Abstract:
The double ionization of helium in bichromatic, circularly polarized intense laser fields is analyzed with a classical ensemble approach. It is found that counterrotating fields produce significant nonsequential double-ion yield and drive novel ionization dynamics. It is shown that distinct pathways to ionization can be modified by altering the relative intensities of the two colors, allowing for unique control of strong-field processes. Electrons are observed to return to the ion at different angles from the angle of ionization, opening new possibilities for probing electronic and molecular structure on the ultrafast time scale.
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