Asymmetries in ionization of atomic superposition states by ultrashort laser pulses
| Autor: | Andreas Becker, Joel Venzke, Agnieszka Jaron-Becker |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Helium atom
Quantum superposition lcsh:Medicine 02 engineering and technology Photoionization 01 natural sciences law.invention chemistry.chemical_compound Superposition principle law Ionization 0103 physical sciences Physics::Atomic and Molecular Clusters High harmonic generation Physics::Atomic Physics 010306 general physics lcsh:Science Physics Multidisciplinary lcsh:R 021001 nanoscience & nanotechnology Laser chemistry lcsh:Q Atomic physics 0210 nano-technology Ultrashort pulse |
| Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-9 (2020) |
| ISSN: | 2045-2322 |
| Popis: | Progress in ultrafast science allows for probing quantum superposition states with ultrashort laser pulses in the new regime where several linear and nonlinear ionization pathways compete. Interferences of pathways can be observed in the photoelectron angular distribution and in the past they have been analyzed for atoms and molecules in a single quantum state via anisotropy and asymmetry parameters. Those conventional parameters, however, do not provide comprehensive tools for probing superposition states in the emerging research area of bright and ultrashort light sources, such as free-electron lasers and high-order harmonic generation. We propose a new set of generalized asymmetry parameters which are sensitive to interference effects in the photoionization and the interplay of competing pathways as the laser pulse duration is shortened and the laser intensity is increased. The relevance of the parameters is demonstrated using results of state-of-the-art numerical solutions of the time-dependent Schrödinger equation for ionization of helium atom and neon atom. |
| Databáze: | OpenAIRE |
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