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@ARTICLE{Chen:208215,
      author       = {Chen, Yi-Jen and Pabst, Stefan and Karamatskou, Antonia and
                      Santra, Robin},
      title        = {{T}heoretical {C}haracterization of the {C}ollective
                      {R}esonance {S}tates underlying the {X}enon {G}iant {D}ipole
                      {R}esonance},
      journal      = {Physical review / A},
      volume       = {91},
      number       = {3},
      issn         = {1050-2947},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2015-01633},
      pages        = {032503},
      year         = {2015},
      note         = {OA},
      abstract     = {We present a detailed theoretical characterization of the
                      two fundamental collective resonances underlying the xenon
                      giant dipole resonance (GDR). This is achieved consistently
                      by two complementary methods implemented within the
                      framework of the configuration-interaction singles (CIS)
                      theory. The first method accesses the resonance states by
                      diagonalizing the many-electron Hamiltonian using the smooth
                      exterior complex scaling technique. The second method
                      involves a different application of the Gabor analysis to
                      wave-packet dynamics. We identify one resonance at an
                      excitation energy of 74 eV with a lifetime of 27 as and the
                      second at 107eV with a lifetime of 11as. Our work provides a
                      deeper understanding of the nature of the resonances
                      associated with the GDR: a group of close-lying intrachannel
                      resonances splits into two far-separated resonances through
                      interchannel couplings involving the 4d electrons. The CIS
                      approach allows a transparent interpretation of the two
                      resonances as new collective modes. Due to the strong
                      entanglement between the excited electron and the ionic
                      core, the resonance wave functions are not dominated by any
                      single particle-hole state. This gives rise to plasma-like
                      collective oscillations of the 4d shell as a whole.},
      cin          = {FS-CFEL-3},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-CFEL-3-20120731},
      pnm          = {6211 - Extreme States of Matter: From Cold Ions to Hot
                      Plasmas (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6211},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000350589100002},
      doi          = {10.1103/PhysRevA.91.032503},
      url          = {https://bib-pubdb1.desy.de/record/208215},
}