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  Attosecond XUV absorption spectroscopy of doubly excited states in helium atoms dressed by a time-delayed femtosecond infrared laser

Yang, Z. Q., Ye d, D. F., Ding, T., Pfeifer, T., & Fu, L. B. (2015). Attosecond XUV absorption spectroscopy of doubly excited states in helium atoms dressed by a time-delayed femtosecond infrared laser. Physical Review A: Atomic, Molecular, and Optical Physics, 91(1): 013414. doi:10.1103/PhysRevA.91.013414.

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http://dx.doi.org/10.1103/PhysRevA.91.013414 (Publisher version)
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Yang, Z. Q.1, Author
Ye d, D. F.1, Author
Ding, Thomas2, Author           
Pfeifer, Thomas2, Author           
Fu, L. B.1, Author
Affiliations:
1School of Physics, Beijing Institute of Technology, Beijing 100081, China National Key Laboratory of Science and Technology on Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China Key Laboratory of Ecophysics and Department of Physics, College of Science, Shihezi University, Shihezi 832003, China, ou_persistent22              
2Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society, ou_2025284              

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 Abstract: In the present paper, we investigate the time-resolved transient absorption spectroscopy of doubly excited states of helium atoms by solving the time-dependent two-electron Schrödinger equation numerically based on a one-dimensional model. The helium atoms are subjected to an extreme ultraviolet (XUV) attosecond pulse and a time-delayed infrared (IR) few-cycle laser pulse. A superposition of doubly excited states populated by the XUV pulse is identified, which interferes with the direct ionization pathway leading to Fano resonance profiles in the photoabsorption spectrum. In the presence of an IR laser, however, the Fano line profiles are strongly modified: A shifting, splitting, and broadening of the original absorption lines is observed when the XUV attosecond pulse and infrared few-cycle laser pulse overlap in time, which is in good agreement with recent experimental results. At certain time delays, we observe symmetric Lorentz, inverted Fano profiles, and even negative absorption cross sections indicating that the XUV light can be amplified during the interaction with atoms. We further prove that the above pictures are general for different doubly excited states by suitably varying the frequency of the IR field to coherently couple the corresponding states.

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Language(s): eng - English
 Dates: 2015-01-27
 Publication Status: Published online
 Pages: 5 pages
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevA.91.013414
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Title: Physical Review A: Atomic, Molecular, and Optical Physics
  Other : Phys. Rev. A
  Other : Phys. Rev. A: At., Mol., Opt. Phys.
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 91 (1) Sequence Number: 013414 Start / End Page: - Identifier: ISSN: 1050-2947
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012_2