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Journal Article

Distinguishing two mechanisms for enhanced ionization of H2+ using orthogonal two-color laser fields

MPS-Authors

Liu,  Kunlong
Max Planck Institute of Microstructure Physics, Max Planck Society;

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Barth,  Ingo
Max Planck Institute of Microstructure Physics, Max Planck Society;

External Resource

https://doi.org/10.1103/PhysRevA.103.013103
(Publisher version)

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PhysRevA.103.013103.pdf
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Citation

Liu, K., & Barth, I. (2021). Distinguishing two mechanisms for enhanced ionization of H2+ using orthogonal two-color laser fields. Physical Review A, 103(1): 013103. doi:10.1103/PhysRevA.103.013103.


Cite as: https://hdl.handle.net/21.11116/0000-0008-6D43-3
Abstract
We theoretically study the ionization enhancement of the diatomic molecular ion H2+ at two critical internuclear distances R, using orthogonal two-color laser fields. The polarization of the fundamental infrared laser field and a weak second-harmonic field is parallel and perpendicular to the molecular axis, respectively. It is observed that adding the second-harmonic field raises slightly the first ionization peak at the smaller critical R, whereas it enhances the second one at the larger critical R significantly. We further analyze the observable evidence which distinguishes two underlying mechanisms responsible for the enhanced ionization of H2+: (i) the resonant excitation along with the coherent interference of the ionizing wave packets from the 1sσg and 2pσu states and (ii) the easier ionization from the up-field site of the molecule.