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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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 electronic transitions. As a result...
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X-ray Imaging

German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with X-rays, and by 1900, X-ray was widely...
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Emission Spectra

When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in the...
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UV–Vis Spectrometers

The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell. Samples for...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

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Published on: July 12, 2017

High-order harmonic generation enhanced by XUV light.

Christian Buth1, Markus C Kohler, Joachim Ullrich

  • 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany. christian.buth@web.de

Optics Letters
|September 3, 2011
PubMed
Summary

We theoretically investigated high-order harmonic generation (HHG) combined with XUV excitation. This study explores core electron excitation and Rabi flopping, impacting HHG spectra for krypton.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • X-ray Science

Background:

  • High-order harmonic generation (HHG) is a key process for generating coherent XUV radiation.
  • Core electron excitation plays a crucial role in atomic and molecular dynamics.

Purpose of the Study:

  • To theoretically investigate the combination of HHG with resonant XUV excitation of core electrons.
  • To analyze the modified HHG spectrum resulting from valence and core recombination.

Main Methods:

  • Theoretical modeling of a two-electron system undergoing HHG and core excitation.
  • Simulation of Rabi flopping between a core vacancy and the valence shell.
  • Analysis of HHG spectra for krypton using 800 nm laser and XUV radiation from FLASH.

Main Results:

  • The study predicts modified HHG spectra due to the interplay between HHG and core electron dynamics.
  • Rabi flopping of a core electron between the valence vacancy and core states is theoretically demonstrated.
  • The impact of resonant XUV excitation on the HHG spectrum is quantified for krypton.

Conclusions:

  • This research opens new avenues for nonlinear XUV physics.
  • The findings have implications for generating attosecond X-ray pulses.
  • The study proposes novel HHG-based spectroscopy techniques involving core orbitals.