Roadmap of ultrafast x-ray atomic and molecular physics

Research output: Contribution to journalReview article

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.

Details

Authors
  • Linda Young
  • Kiyoshi Ueda
  • Markus Gühr
  • Philip H. Bucksbaum
  • Marc Simon
  • Shaul Mukamel
  • Nina Rohringer
  • Kevin C. Prince
  • Claudio Masciovecchio
  • Michael Meyer
  • Artem Rudenko
  • Daniel Rolles
  • Christoph Bostedt
  • Matthias Fuchs
  • David A. Reis
  • Robin Santra
  • Henry Kapteyn
  • Margaret Murnane
  • Heide Ibrahim
  • François Légaré
  • Marc Vrakking
  • Marcus Isinger
  • David Kroon
  • Hans Jakob Wörner
  • Stephen R. Leone
Organisations
External organisations
  • Argonne National Laboratory
  • University of Chicago
  • Tohoku University
  • University of Potsdam
  • Stanford Linear Accelerator Center (SLAC)
  • Stanford University
  • University of California, Irvine
  • German Electron Synchrotron (DESY)
  • University of Hamburg
  • Elettra Sincrotrone Trieste
  • Kansas State University
  • University of Nebraska - Lincoln
  • JILA
  • University of Colorado
  • Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy
  • ETH Zürich
  • University of California, Berkeley
  • Pierre and Marie Curie University
  • European XFEL GmbH
  • INRS-EMT, Energy, Materials and Telecommunications
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics

Keywords

  • attosecond phenomena, table-top sources, ultrafast molecular dynamics, x-ray free-electron lasers, x-ray spectroscopies and phenomena
Original languageEnglish
Article number032003
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume51
Issue number3
Publication statusPublished - 2018 Jan 9
Publication categoryResearch
Peer-reviewedYes