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Photoabsorption of attosecond XUV light pulses by two strongly laser-coupled autoionizing states | | Wei-Chun Chu
; C. D. Lin
; | | Date: |
22 May 2012 | | Abstract: | We study theoretically the photoabsorption spectra of an attosecond XUV pulse
by a laserdressed atomic system. A weak XUV excites an autoionizing state which
is strongly coupled to another autoionizing state by a laser. The theory was
applied to explain two recent experiments [Loh, Greene, and Leone, Chem. Phys.
350, 7 (2008); Wang, Chini, Chen, Zhang, Cheng, He, Cheng, Wu, Thumm, and
Chang, Phys. Rev. Lett. 105 143002 (2010)] where the absorption spectra of the
XUV lights were measured against the time delay between the laser and the XUV.
In another example, we study an attosecond pulse exciting the 2s2p(1P)
resonance of helium which is resonantly coupled to the 2s2(1S) resonance by a
moderately intense 540 nm laser. The relation between the photoabsorption
spectra and the photoelectron spectra and the modification of the transmitted
lights in such an experiment are analyzed. The role of Rabi flopping between
the two autoionizing states within their lifetimes is investigated with respect
to the laser intensity and detuning. | | Source: | arXiv, 1205.4766 | | Services: | Forum | Review | PDF | Favorites | |
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