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Lorentz meets Fano in spectral line shapes: a universal phase and its laser control.(REPORTS)(symmetric Lorentzian and asymmetric Fano line shapes)(Report)(Author abstract)

Ott, Christian ; Kaldun, Andreas ; Raith, Philipp ; Meyer, Kristina ; Laux, Martin ; Evers, Jorg ; Keitel, Christoph H. ; Greene, Chris H. ; Pfeifer, Thomas

Science, May 10, 2013, Vol.340(6133), p.716(5) [Periódico revisado por pares]

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  • Título:
    Lorentz meets Fano in spectral line shapes: a universal phase and its laser control.(REPORTS)(symmetric Lorentzian and asymmetric Fano line shapes)(Report)(Author abstract)
  • Autor: Ott, Christian ; Kaldun, Andreas ; Raith, Philipp ; Meyer, Kristina ; Laux, Martin ; Evers, Jorg ; Keitel, Christoph H. ; Greene, Chris H. ; Pfeifer, Thomas
  • Assuntos: Lorentz Transformation -- Research ; Quantum Mechanics -- Research ; Spectroscopy -- Methods
  • É parte de: Science, May 10, 2013, Vol.340(6133), p.716(5)
  • Descrição: Symmetric Lorentzian and asymmetric Fano Line shapes are fundamental spectroscopic signatures that quantify the structural and dynamical properties of nuclei, atoms, molecules, and solids. This study introduces a universal temporal-phase formalism, mapping the Fano asymmetry parameter q to a phase [phi] of the time-dependent dipole response function. The formalism is confirmed experimentally by Laser-transforming Fano absorption lines of autoionizing helium into Lorentzian lines after attosecond-pulsed excitation. We also demonstrate the inverse, the transformation of a naturally Lorentzian line into a Fano profile. A further application of this formalism uses quantum-phase control to amplify extreme-ultraviolet light resonantly interacting with He atoms. The quantum phase of excited states and its response to interactions can thus be extracted from line-shape analysis, with applications in many branches of spectroscopy. 10.1126/science.1234407
  • Idioma: English

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