Resolving Ultra-Fast Spin-Orbit Dynamics in Heavy Many-Electron Atoms

Jack Wragg, Daniel D. A. Clarke, Gregory S. J. Armstrong, Andrew C. Brown, Connor P. Ballance, Hugo W. Van Der Hart

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
172 Downloads (Pure)


We use R-Matrix with Time-dependence (RMT) theory, with spin-orbit effects included, to study krypton irradiated by two time-delayed XUV ultrashort pulses. The first pulse excites the atom to 4s$^2$4p$^5$5s. The second pulse then excites 4s4p65s autoionising levels, whose population can be observed through their subsequent decay. By varying the time delay between the two pulses, we are able to control the excitation pathway to the autoionising states. The use of cross-polarised light pulses allows us to isolate the two-photon pathway, with one photon taken from each pulse.
Original languageEnglish
Article number163001
Pages (from-to)1
JournalPhysical Review Letters
Publication statusPublished - 15 Oct 2019


  • First-principles calculations
  • atoms
  • Spin-orbit coupling
  • Single- and few-photon ionization & excitation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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