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Related Concept Videos

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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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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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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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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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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Related Experiment Video

Updated: Nov 2, 2025

Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Dual-comb spectroscopy.

Ian Coddington1, Nathan Newbury1,2, William Swann1

  • 1National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA.

Optica
|June 16, 2021
PubMed
Summary
This summary is machine-generated.

Dual-comb spectroscopy uses two frequency combs for ultrahigh-resolution measurements. This advanced technique offers rapid, sensitive broadband spectroscopy, potentially surpassing conventional methods.

Keywords:
(280.0280) Remote sensing and sensors(300.0300) Spectroscopy(300.6360) Spectroscopy, laser(300.6495) Spectroscopy, terahertz

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Area of Science:

  • Spectroscopy
  • Quantum Optics
  • Metrology

Background:

  • Conventional spectrometers have limitations in size and instrument response.
  • Frequency combs offer high resolution, accuracy, broad bandwidth, and brightness.
  • Emerging spectroscopic tools are needed for advanced applications.

Purpose of the Study:

  • To review dual-comb spectroscopy (DCS).
  • To summarize the current state-of-the-art in DCS.
  • To highlight the potential of DCS for future spectroscopic applications.

Main Methods:

  • Utilizes two coherent frequency combs.
  • Enables measurement of a sample's spectral response on a comb tooth-by-tooth basis.
  • Leverages the properties of frequency combs for spectroscopy.

Main Results:

  • DCS provides ultrahigh-resolution and high-sensitivity broadband spectroscopy.
  • Measurements are rapid and free from conventional spectrometer limitations.
  • Demonstrates the capability to surpass conventional broadband spectroscopy.

Conclusions:

  • Dual-comb spectroscopy is a rapidly maturing technology.
  • DCS offers significant advantages over conventional spectroscopic techniques.
  • Future advancements in frequency comb technology will further enhance DCS capabilities for diverse applications.