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  1. Home
  3. Spatial Mapping Of Valence Excited-state Landscapes Using Time-resolved Shake-down Spectroscopy.
  1. Home
  3. Spatial Mapping Of Valence Excited-state Landscapes Using Time-resolved Shake-down Spectroscopy.

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Spatial Mapping of Valence Excited-State Landscapes Using Time-Resolved Shake-Down Spectroscopy.

Henry J Thompson1, Michele Devetta2, Davide Faccialà2

  • 1School of Chemistry and Chemical Engineering, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.

The Journal of Physical Chemistry. A
|May 22, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Time-resolved X-ray photoelectron spectroscopy (XPS) tracks 2-iodothiophene photodissociation. Shake-down transitions reveal ultrafast structural dynamics with high sensitivity to molecular geometry.

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Area of Science:

  • Chemical Physics
  • Molecular Spectroscopy
  • Photochemistry

Background:

  • Understanding photodissociation dynamics is crucial for chemical reaction mechanisms.
  • X-ray photoelectron spectroscopy (XPS) provides insights into electronic structure and bonding.
  • Time-resolved techniques enable the study of transient species and reaction pathways.

Purpose of the Study:

  • To investigate the photodissociation dynamics of 2-iodothiophene using time-resolved XPS.
  • To explore the utility of shake-down transitions as probes of ultrafast structural changes.
  • To establish a direct structural mapping of C-I bond cleavage.

Main Methods:

  • Excitation of 2-iodothiophene using 262 nm laser.
  • Time-resolved X-ray photoelectron spectroscopy (XPS) measurements.
  • Analysis of transient XPS features, including direct ionization and shake-down peaks.
  • Correlation of spectral shifts with simulated C-I bond lengths.

    • Main Results:

    • Observed direct ionization signals with minimal energy shifts during C-I bond cleavage.
    • Detected pronounced shake-down satellite peaks exhibiting a substantial 5 eV shift.
    • Established a direct structural mapping by correlating shake-down shifts with C-I bond lengths.
    • Demonstrated the exceptional sensitivity of shake-down channels to molecular geometry.

    Conclusions:

    • Shake-down transitions in XPS are highly sensitive to molecular geometry.
    • These transitions serve as a powerful new probe for ultrafast structural dynamics.
    • Time-resolved XPS provides detailed insights into photodissociation reaction coordinates.