期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.103001
关键词
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资金
- European Research Council (ERC) [X-MuSiC616783]
- Singapore Ministry of Education [RG105/17]
- BMBF [05K13PM2]
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 2p-3d bound-bound transitions between the spin-orbit multiplets P-3(0,1,2) and( 3)D(1,2,3) of the transiently produced doubly charged Ne2+ ion are revealed, with time-dependent spectral changes over a time-delay range of (2.4 +/- 0.3) 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.
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