Transition between Mechanisms of Laser-Induced Field-Free Molecular Orientation
| Autor: | Hui Li, Matthias F. Kling, Irina Znakovskaya, Sankar De, Dipanwita Ray, Michael Spanner, Igor Litvinyuk, Paul B. Corkum, C. L. Cocke |
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| Rok vydání: | 2014 |
| Předmět: |
Ionization
Field (physics) Atomic Physics (physics.atom-ph) FOS: Physical sciences General Physics and Astronomy Hyperpolarizability Measurements of Theoretical calculations Physics - Atomic Physics law.invention law Physics - Chemical Physics Nonperturbative Molecule Depletion mechanism Field-free orientation Chemical Physics (physics.chem-ph) Physics Molecules Laser Laser intensities Molecular orientation Orientation (vector space) Laser intensity Hyper-polarizability Atomic physics Molecular ionization |
| Zdroj: | Physical Review Letters. 112 |
| ISSN: | 1079-7114 0031-9007 |
| DOI: | 10.1103/physrevlett.112.113005 |
| Popis: | The transition between two distinct mechanisms for the laser-induced field-free orientation of CO molecules is observed via measurements of orientation revival times and subsequent comparison to theoretical calculations. In the first mechanism, which we find responsible for the orientation of CO up to peak intensities of 8 x 10^13 W/cm^2, the molecules are impulsively oriented through the hyperpolarizability interaction. At higher intensities, asymmetric depletion through orientation-selective ionization is the dominant orienting mechanism. In addition to the clear identification of the two regimes of orientation, we propose that careful measurements of the onset of the orientation depletion mechanism as a function of the laser intensity will provide a relatively simple route to calibrate absolute rates of non-perturbative strong-field molecular ionization. Comment: 5 pages, 2 figures |
| Databáze: | OpenAIRE |
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