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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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New laboratory light sources enable atom-specific probing of coupled electronic, spin, and lattice dynamics in materials. This advances understanding of energy conversion and quantum technologies by revealing ultrafast interactions.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Understanding coupled electronic, spin, and lattice dynamics in solids is crucial for energy, information, and quantum technologies.
  • Directly observing these interactions at atomic and femtosecond scales remains a significant challenge.

Purpose of the Study:

  • To present advances in laboratory-based coherent extreme ultraviolet (XUV) and soft X-ray light sources.
  • To demonstrate their capability for atom-specific probing of coupled dynamics in diverse materials.

Main Methods:

  • Development of laboratory-based coherent XUV and soft X-ray sources.
  • Time-resolved spectroscopy utilizing core-to-valence transitions.
  • Advanced beamline design and experimental geometries for element- and site-specific measurements.

Main Results:

  • Time-resolved XUV/soft X-ray spectroscopy provides element-, site-, and spin-specific insights.
  • Demonstrated sensitivity to lattice distortions, charge-transfer states, spin transitions, and phonon-mediated phase transformations.
  • Expanded understanding of vibronic and spin-vibronic phenomena in various material systems.

Conclusions:

  • Laboratory-based XUV/soft X-ray sources offer powerful tools for studying ultrafast dynamics.
  • These techniques are crucial for elucidating nonequilibrium phenomena in quantum and functional materials.
  • Future developments promise deeper insights into complex material behaviors.