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0.5-keV Soft X-ray attosecond continua.

S M Teichmann1, F Silva1, S L Cousin1

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Researchers generated attosecond soft X-ray pulses for real-time material analysis. This breakthrough enables element-specific probing of electronic dynamics, advancing ultrafast science.

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Area of Science:

  • Physics
  • Materials Science
  • Chemistry

Background:

  • Attosecond extreme ultraviolet (XUV) pulses enable real-time electronic dynamics interrogation.
  • Element-selective probing requires soft X-ray pulses (above 200 eV) covering fundamental absorption edges.

Purpose of the Study:

  • To generate carrier-envelope-controlled soft X-ray supercontinua.
  • To achieve attosecond pulses with element specificity for materials analysis.

Main Methods:

  • Exploitation of a transient phase matching regime.
  • Generation of broadband soft X-ray supercontinua.

Main Results:

  • Soft X-ray supercontinua with pulse energies up to 2.9±0.1 pJ.
  • Photon flux of (7.3±0.1) × 10^7 photons per second.
  • Attosecond pulses with a 13 as transform limit across the water window.

Conclusions:

  • Bridged the gap between ultrafast temporal resolution and element-specific probing.
  • Paved the way for attosecond science at fundamental absorption edges.
  • Enabled real-time investigation of charge dynamics and excitations in materials.