تقرير
Nonlinear coherence effects in transient-absorption ion spectroscopy with stochastic extreme-ultraviolet free-electron laser pulses
| العنوان: | Nonlinear coherence effects in transient-absorption ion spectroscopy with stochastic extreme-ultraviolet free-electron laser pulses |
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| المؤلفون: | Ding, Thomas, Rebholz, Marc, Aufleger, Lennart, Hartmann, Maximilian, Meyer, Kristina, Stooss, Veit, Magunia, Alexander, Wachs, David, Birk, Paul, Mi, Yonghao, Borisova, Gergana D., Castanheira, Carina da Costa, Rupprecht, Patrick, Loh, Zhi-Heng, Attar, Andrew R., Gaumnitz, Thomas, Roling, Sebastian, Butz, Marco, Zacharias, Helmut, Düsterer, Stefan, Treusch, Rolf, Cavaletto, Stefano M., Ott, Christian, Pfeifer, Thomas |
| المصدر: | Phys. Rev. Lett. 123, 103001 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Physics - Atomic Physics, Quantum Physics |
| الوصف: | We demonstrate time-resolved nonlinear extreme-ultraviolet absorption spectroscopy on multiply charged ions, here applied to the doubly charged neon ion, driven by a phase-locked sequence of two intense free-electron laser pulses. Absorption signatures of resonance lines due to 2$p$--3$d$ bound--bound transitions between the spin-orbit multiplets $^3$P$_{0,1,2}$ and $^3$D$_{1,2,3}$ of the transiently produced doubly charged Ne$^{2+}$ ion are revealed, with time-dependent spectral changes over a time-delay range of $(2.4\pm0.3)\,\text{fs}$. Furthermore, we observe 10-meV-scale spectral shifts of these resonances owing to the AC Stark effect. We use a time-dependent quantum model to explain the observations by an enhanced coupling of the ionic quantum states with the partially coherent free-electron-laser radiation when the phase-locked pump and probe pulses precisely overlap in time. |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.123.103001 |
| URL الوصول: | http://arxiv.org/abs/1907.07182 |
| رقم الأكسشن: | edsarx.1907.07182 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.123.103001 |
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