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@ARTICLE{Young:419011,
      author       = {Young, Linda and Ueda, Kiyoshi and Gühr, Markus and
                      Bucksbaum, Philip H and Simon, Marc and Mukamel, Shaul and
                      Rohringer, Nina and Prince, Kevin C and Masciovecchio,
                      Claudio and Meyer, Michael and Rudenko, Artem and Rolles,
                      Daniel and Bostedt, Christoph and Fuchs, Matthias and Reis,
                      David A and Santra, Robin and Kapteyn, Henry and Murnane,
                      Margaret and Ibrahim, Heide and Légaré, François and
                      Vrakking, Marc and Isinger, Marcus and Kroon, David and
                      Gisselbrecht, Mathieu and L’Huillier, Anne and Wörner,
                      Hans Jakob and Leone, Stephen R},
      title        = {{R}oadmap of ultrafast x-ray atomic and molecular physics},
      journal      = {Journal of physics / B},
      volume       = {51},
      number       = {3},
      issn         = {0022-3700},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PUBDB-2019-00875},
      pages        = {032003},
      year         = {2018},
      abstract     = {X-ray free-electron lasers (XFELs) and table-top sources of
                      x-rays based upon high harmonic generation (HHG) have
                      revolutionized the field of ultrafast x-ray atomic and
                      molecular physics, largely due to an explosive growth in
                      capabilities in the past decade. XFELs now provide
                      unprecedented intensity (1020 W cm−2) of x-rays at
                      wavelengths down to ~1 Ångstrom, and HHG provides
                      unprecedented time resolution (~50 attoseconds) and a
                      correspondingly large coherent bandwidth at longer
                      wavelengths. For context, timescales can be referenced to
                      the Bohr orbital period in hydrogen atom of 150 attoseconds
                      and the hydrogen-molecule vibrational period of 8
                      femtoseconds; wavelength scales can be referenced to the
                      chemically significant carbon K-edge at a photon energy of
                      ~280 eV (44 Ångstroms) and the bond length in methane of ~1
                      Ångstrom. With these modern x-ray sources one now has the
                      ability to focus on individual atoms, even when embedded in
                      a complex molecule, and view electronic and nuclear motion
                      on their intrinsic scales (attoseconds and Ångstroms).
                      These sources have enabled coherent diffractive imaging,
                      where one can image non-crystalline objects in three
                      dimensions on ultrafast timescales, potentially with atomic
                      resolution. The unprecedented intensity available with XFELs
                      has opened new fields of multiphoton and nonlinear x-ray
                      physics where behavior of matter under extreme conditions
                      can be explored. The unprecedented time resolution and pulse
                      synchronization provided by HHG sources has kindled
                      fundamental investigations of time delays in
                      photoionization, charge migration in molecules, and dynamics
                      near conical intersections that are foundational to AMO
                      physics and chemistry. This roadmap coincides with the year
                      when three new XFEL facilities, operating at Ångstrom
                      wavelengths, opened for users (European XFEL, Swiss-FEL and
                      PAL-FEL in Korea) almost doubling the present worldwide
                      number of XFELs, and documents the remarkable progress in
                      HHG capabilities since its discovery roughly 30 years ago,
                      showcasing experiments in AMO physics and other
                      applications. Here we capture the perspectives of 17 leading
                      groups and organize the contributions into four categories:
                      ultrafast molecular dynamics, multidimensional x-ray
                      spectroscopies; high-intensity x-ray phenomena; attosecond
                      x-ray science.},
      cin          = {FS-TUX / FS-CFEL-3 / Eur.XFEL},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-TUX-20170422 / I:(DE-H253)FS-CFEL-3-20120731
                      / $I:(DE-H253)Eur_XFEL-20120731$},
      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:000419798100001},
      doi          = {10.1088/1361-6455/aa9735},
      url          = {https://bib-pubdb1.desy.de/record/419011},
}