Heteronuclear Limit of Strong-Field Ionization: Fragmentation of HeH+ by Intense Ultrashort Laser Pulses
| Autor: | Thomas Stöhlker, Lun Yue, Manfred Lein, Philipp Wustelt, Max Möller, Stefanie Gräfe, Gerhard G. Paulus, Florian Oppermann, A. Max Sayler |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
Double ionization General Physics and Astronomy 01 natural sciences 010305 fluids & plasmas Bond length Impact ionization Heteronuclear molecule Fragmentation (mass spectrometry) Ionization 0103 physical sciences Physics::Atomic and Molecular Clusters Isotopologue Physics::Atomic Physics Atomic physics 010306 general physics Excitation |
| Zdroj: | Physical Review Letters. 121 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.121.073203 |
| Popis: | The laser-induced fragmentation dynamics of this most fundamental polar molecule ${\mathrm{HeH}}^{+}$ are measured using an ion beam of helium hydride and an isotopologue at various wavelengths and intensities. In contrast to the prevailing interpretation of strong-field fragmentation, in which stretching of the molecule results primarily from laser-induced electronic excitation, experiment and theory for nonionizing dissociation, single ionization, and double ionization both show that the direct vibrational excitation plays the decisive role here. We are able to reconstruct fragmentation pathways and determine the times at which each ionization step occurs as well as the bond length evolution before the electron removal. The dynamics of this extremely asymmetric molecule contrast the well-known symmetric systems leading to a more general picture of strong-field molecular dynamics and facilitating interpolation to systems between the two extreme cases. |
| Databáze: | OpenAIRE |
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