Strong-field ionization of water: Nuclear dynamics revealed by varying the pulse duration
| Autor: | Philip H. Bucksbaum, Chuan Cheng, Greg McCracken, Ruaridh Forbes, W. H. Mills, Thomas Weinacht, Andrew J. Howard, Varun Makhija, Michael Spanner |
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| Rok vydání: | 2021 |
| Předmět: |
Atomic Physics (physics.atom-ph)
Double ionization FOS: Physical sciences 01 natural sciences Physics - Atomic Physics 010305 fluids & plasmas Ion law.invention law Physics - Chemical Physics 0103 physical sciences Physics::Atomic and Molecular Clusters Physics::Atomic Physics Physics::Chemical Physics 010306 general physics Chemical Physics (physics.chem-ph) Physics Momentum (technical analysis) Pulse duration Laser Pulse (physics) Tunnel ionization Atomic physics Optics (physics.optics) Physics - Optics Self-ionization of water |
| Zdroj: | Physical Review A. 103 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | Polyatomic molecules in strong laser fields can undergo substantial nuclear motion within tens of femtoseconds. Ion imaging methods based on dissociation or Coulomb explosion therefore have difficulty faithfully recording the geometry dependence of the field ionization that initiates the dissociation process. Here we compare the strong-field double ionization and subsequent dissociation of water (both H$_2$O and D$_2$O) in 10-fs and 40-fs 800-nm laser pulses. We find that 10-fs pulses turn off before substantial internuclear motion occurs, whereas rapid internuclear motion can take place during the double ionization process for 40-fs pulses. The short-pulse measurements are consistent with a simple tunnel ionization picture, whose predictions help interpret the motion observed in the long-pulse measurements. 9 pages, 5 figures |
| Databáze: | OpenAIRE |
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