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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Core-level nonlinear spectroscopy triggered by stochastic X-ray pulses.

Yves Kayser1,2, Chris Milne3, Pavle Juranić3

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This study introduces stochastic X-ray pulses for advanced two-dimensional spectroscopy, enabling simultaneous mapping of electronic states. This novel method overcomes unpredictability challenges in stochastic processes for materials science research.

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Area of Science:

  • Atomic and molecular physics
  • Materials science
  • Spectroscopy

Background:

  • Stochastic processes are crucial across diverse scientific fields but pose significant investigation challenges due to their inherent unpredictability.
  • Understanding electronic states in matter under intense radiation is vital for materials science and fundamental physics.

Purpose of the Study:

  • To demonstrate the deliberate use of stochastic X-ray pulses in two-dimensional spectroscopy.
  • To enable simultaneous mapping of unoccupied and occupied electronic states of atoms.
  • To develop a method for analyzing stochastic excitation data in spectroscopy.

Main Methods:

  • Utilized stochastic X-ray pulses in a two-dimensional spectroscopy setup.
  • Developed a matrix formalism to extract electronic state information from stochastic excitation data.
  • Maintained the time structure of incident X-ray pulses during measurement.

Main Results:

  • Successfully mapped both unoccupied and occupied electronic states simultaneously.
  • Demonstrated a regime where matter's opacity and transparency depend on incident intensity and photon energy.
  • Validated a matrix formalism for analyzing stochastic spectroscopic data.

Conclusions:

  • Stochastic X-ray pulses can be deliberately employed in spectroscopy to overcome inherent unpredictability.
  • The developed matrix formalism provides a transferable tool for investigating electronic structures under intense X-ray irradiation.
  • This approach preserves temporal information, allowing detailed studies of material responses.