Strong-field polarizability-enhanced dissociative ionization
| Autor: | Florian Oppermann, Gerhard G. Paulus, Lun Yue, Philipp Wustelt, Manfred Lein, Stefanie Gräfe, A. Max Sayler |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Atomic Physics (physics.atom-ph) Double ionization FOS: Physical sciences Semiclassical physics 01 natural sciences Physics - Atomic Physics 010305 fluids & plasmas Polarizability Ionization 0103 physical sciences Femtosecond Kinetic isotope effect Physics::Atomic and Molecular Clusters Isotopologue Physics::Atomic Physics Physics::Chemical Physics Atomic physics 010306 general physics Anisotropy |
| Zdroj: | Physical Review A. 98 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.98.043418 |
| Popis: | We investigate dissociative single and double ionization of HeH+ induced by intense femtosecond laser pulses. By employing a semi-classical model with nuclear trajectories moving on field-dressed surfaces and ionization events treated as stochastical jumps, we identify a strong-field mechanism wherein the molecules dynamically align along the laser polarization axis and stretch towards a critical internuclear distance before getting dissociative ionized. As the tunnel-ionization rate is greater for larger internuclear distance and for aligned samples, ionization is enhanced. The strong dynamical rotation is traced back to a maximum in the parallel component of the internuclear-distance-dependent polarizability tensor. Qualitative agreement with our experimental observations is found. Finally the criteria for observing the isotope effect for the ion angular distribution is discussed. Comment: 7 pages |
| Databáze: | OpenAIRE |
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