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Related Concept Videos

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Attosecond Optical Orientation.

Lauren B Drescher1,2,3, Nicola Mayer3,4, Kylie Gannan1

  • 1University of California, Department of Chemistry, Berkeley, California 94720, USA.

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|October 31, 2025
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Summary
This summary is machine-generated.

This study introduces circular-dichroic attosecond transient absorption spectroscopy to probe chiral and spin properties. The new method uses two circularly polarized light pulses to orient angular momentum on an attosecond timescale.

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Area of Science:

  • Quantum optics
  • Attosecond science
  • Spectroscopy

Background:

  • Circularly polarized light probes symmetry-dependent properties like chirality and spin.
  • Traditional circular-dichroic measurements require external symmetry breaking.
  • Attosecond transient absorption spectroscopy (ATAS) provides high temporal resolution.

Purpose of the Study:

  • To develop a novel circular-dichroic attosecond transient absorption spectroscopy (CD-ATAS) method.
  • To probe symmetry-dependent properties in isotropic media.
  • To investigate the dynamics of excited states and spin-dependent phenomena.

Main Methods:

  • Utilizing two circularly polarized pump and probe pulses.
  • Optically orienting angular momentum of excited states on an attosecond timescale.
  • Measuring attosecond transient absorption spectra of Helium Rydberg states.

Main Results:

  • Observed spectral reshaping of extreme ultraviolet (XUV) transient absorption due to AC Stark effect.
  • Demonstrated the role of dipole selection and propensity rules.
  • Successfully measured circular-dichroic signals in an isotropic medium.

Conclusions:

  • CD-ATAS enables symmetry-dependent measurements without external symmetry breaking.
  • The method provides insights into excited-state coupling pathways.
  • Opens new avenues for studying spin dynamics using attosecond optical orientation.