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Preparation and control of electronic wave packets in neutral molecules via attosecond x-ray processes

Emanuele Rossi1,2,3,*, Stasis Chuchurka1,2,†, Kaushik D. Nanda4,‡, Anna I. Krylov4, Nina Rohringer2,1,3,§, and Robin Santra2,1,3,∥

  • *Present address: DTU Chemistry, Technical University of Denmark, Kemitorvet 207, 2800 Kongens Lyngby, Denmark.
  • †Present address: Institute of Physical Chemistry, Friedrich Schiller University Jena, Jena, Germany.
  • ‡Present address: Q-Chem, Inc., 6601 Owens Drive, Suite 240, Pleasanton, CA 94588, USA.
  • §Contact author: nina.rohringer@desy.de
  • ∥Contact author: robin.santra@cfel.de

Phys. Rev. A 114, 053104 – Published 6 November, 2026

DOI: https://doi.org/10.1103/sprw-mrh2

Abstract

We present a perturbative framework for computing the dynamics of an electronic wave packet launched by an attosecond x-ray pulse in a neutral molecule. The x-ray pulse excites the molecule via both x-ray absorption and impulsive stimulated x-ray Raman scattering (ISXRS), coherently populating both the core-excited states and valence-excited states. We describe the electronic structure within the equation-of-motion coupled-cluster framework, adopting a compact representation of the sum-over-states expression characterizing the second-order perturbative description of ISXRS. We study the coherent electronic dynamics in carbonyl sulfide and oxazole utilizing the time-dependent difference electron density, decomposing it in terms of its perturbative components. While the core-excited components dominate the initial stages of the dynamics, the valence-excited components dominate the electronic dynamics on a longer timescale. The pulse polarization controls the symmetry of the states included in the wave packet. We show how the spatial symmetry of the states plays a role in shaping the spatial properties of charge migration. The atomic specificity of the ISXRS process translates directly into the initial localization of the wave packet. This determines the starting point of charge migration, shaping its subsequent evolution.

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