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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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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 process,...
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UV–Vis Spectrum

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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
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Published on: October 30, 2012

Extreme ultraviolet frequency comb metrology.

Dominik Z Kandula1, Christoph Gohle, Tjeerd J Pinkert

  • 1Institute for Lasers, Life and Biophotonics Amsterdam, VU University, De Boelelaan 1081, 1081HV Amsterdam, The Netherlands.

Physical Review Letters
|September 28, 2010
PubMed
Summary
This summary is machine-generated.

Frequency comb (FC) lasers now achieve remarkable precision in the extreme ultraviolet (XUV) region. This breakthrough enables highly accurate measurements of atomic properties, challenging theoretical calculations.

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

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Area of Science:

  • Quantum Optics
  • Atomic Physics
  • Spectroscopy

Background:

  • Frequency comb (FC) lasers offer unparalleled precision.
  • Extreme ultraviolet (XUV) region (wavelengths < 100 nm) was previously inaccessible to FC technology.
  • Accurate measurements in the XUV are crucial for testing fundamental physics theories.

Purpose of the Study:

  • To extend the precision of FC lasers into the XUV spectral region.
  • To demonstrate phase coherence of an XUV FC source.
  • To perform high-accuracy measurements of atomic transition frequencies.

Main Methods:

  • Generated an XUV FC near 51 nm via amplification and coherent up-conversion of near-infrared femtosecond FC pulses.
  • Utilized helium atoms as a 'ruler' and phase detector to demonstrate XUV FC phase coherence.
  • Observed stable, high-contrast Ramsey-like fringes by scanning the XUV FC over helium P states.

Main Results:

  • Successfully generated a phase-coherent FC in the XUV region.
  • Extracted the absolute transition frequency in the XUV with high accuracy.
  • Determined the ionization energy of Helium-4 ((4)He) to be 5,945,204,212(6) MHz, an order of magnitude improvement.

Conclusions:

  • The precision of FC lasers has been successfully transferred to the XUV region.
  • The new measurement challenges existing Quantum Electrodynamics (QED) calculations for two-electron systems.
  • This work opens new avenues for high-precision spectroscopy in the XUV.