Laser-assisted-autoionization dynamics of helium resonances with single attosecond pulses
arXiv:1205.4775 · doi:10.1103/PhysRevA.84.033426
Abstract
The strong coupling between two autoionizing states in helium is studied theoretically with the pump-probe scheme. An isolated 100-as XUV pulse is used to excite helium near the 2s2p(1P) resonance state in the presence of an intense infrared (IR) laser. The laser field introduces strong coupling between 2s2p(1P) and 2p^2(1S) states. The IR also can ionize helium from both autoionizing states. By changing the time delay between the XUV and the IR pulses, we investigated the photoelectron spectra near the two resonances. The results are used to explain the recent experiment by Gilbertson et al. [Phys. Rev. Lett. 105, 263003 (2010)]. Using the same isolated attosecond pulse and a 540-nm laser, we also investigate the strong coupling between 2s2p(1P) and 2s^2(1S) by examining how the photoelectron spectra are modified versus the time delay and the possibility of observing Autler-Townes doublet in such experiments.
12 pages, 12 figures
References in corpus (5)
- Attosecond electron spectroscopy using a novel interferometric pump-probe technique
- Transient absorption and reshaping of ultrafast XUV light by laser-dressed helium
- Attosecond Control of Ionization Dynamics
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Cited by in corpus (10)
- Modulation of attosecond beating in resonant two-photon ionization
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- Photoabsorption of attosecond XUV light pulses by two strongly laser-coupled autoionizing states
- Femtosecond transparency in the extreme ultraviolet
- Analysis of interference in attosecond transient absorption in adiabatic condition
- Time-resolved resonant photoionization of He using a time-dependent Feshbach method with ultrashort laser pulses
- Resonant enhancement of a single attosecond pulse in a gas medium by a time-delayed control field
- Probing dipole-forbidden autoionizing states by isolated attosecond pulses
- Quantum Interferometry and Correlated Two-Electron Wave-Packet Observation in Helium
- Fano line shape metamorphosis in resonant two-photon ionization