Characterizing multiphoton excitation using time-resolved X-ray scattering
| Autor: | Philip H. Bucksbaum, James M. Glownia, Matthew R. Ware, James P. Cryan, Adi Natan |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Atomic Physics (physics.atom-ph) QC1-999 Astrophysics::High Energy Astrophysical Phenomena Physics::Optics General Physics and Astronomy FOS: Physical sciences Radiation 01 natural sciences 010305 fluids & plasmas law.invention Physics - Atomic Physics law Physics - Chemical Physics 0103 physical sciences Physics::Atomic and Molecular Clusters Multiphoton excitation 010306 general physics Chemical Physics (physics.chem-ph) Scattering Physics X-ray Laser Femtosecond Atomic physics Ultrashort pulse |
| Zdroj: | Physical Review X, Vol 10, Iss 1, p 011065 (2020) |
| DOI: | 10.48550/arxiv.1911.01323 |
| Popis: | Molecular iodine was photoexcited by a strong 800 nm laser, driving several channels of multiphoton excitation. The motion following photoexcitation was probed using time-resolved X-ray scattering, which produces a scattering map $S(Q,\tau)$. Temporal Fourier transform methods were employed to obtain a frequency-resolved X-ray scattering signal $\tilde{S}(Q,\omega)$. Taken together, $S(Q,\tau)$ and $\tilde{S}(Q,\omega)$ separate different modes of motion, so that mode-specific nuclear oscillatory positions, oscillation amplitudes, directions of motions, and times may be measured accurately. Molecular dissociations likewise have a distinct signature, which may be used to identify both velocities and dissociation time shifts, and also can reveal laser-induced couplings among the molecular potentials. |
| Databáze: | OpenAIRE |
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