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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...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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,...
UV–Vis Spectrometers01:14

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...
UV–Vis Spectrum01:30

UV–Vis Spectrum

When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar absorptivity (ε) or log ε on the y-axis (ordinate)...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

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Related Experiment Video

Updated: Jul 17, 2026

Bringing the Visible Universe into Focus with Robo-AO
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Published on: February 12, 2013

Optical/UV afterglows: Swift UVOT overview.

Keith O Mason1, Patricia Boyd, Mathew Page

  • 1PPARC, Polaris House, North Star Avenue, Swindon, Wilts SN2 1SZ, UK. kom@mssl.ucl.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|February 13, 2007
PubMed
Summary

The Swift Ultraviolet and Optical Telescope (UVOT) reveals complex gamma-ray burst afterglows, challenging simple explosion models. Combined X-ray and UV/optical data offer new insights into these cosmic events and their host galaxies.

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Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation
09:53

Molecular Beam Mass Spectrometry With Tunable Vacuum Ultraviolet (VUV) Synchrotron Radiation

Published on: October 30, 2012

Area of Science:

  • Astrophysics
  • Cosmic explosions
  • Multi-wavelength astronomy

Background:

  • The Swift Observatory's Ultraviolet and Optical Telescope (UVOT) observes gamma-ray bursts (GRBs) and their afterglows.
  • Multi-wavelength data from UVOT and the Swift X-ray Telescope provide crucial diagnostic power.

Purpose of the Study:

  • To analyze the behavior of GRB afterglows using UVOT data.
  • To investigate the capabilities of UVOT for observing supernovae.
  • To explore the use of combined X-ray and UV/optical data for studying GRB host galaxy environments.

Main Methods:

  • Observation and analysis of GRB afterglows using the UVOT instrument.
  • Comparison of observed afterglow behavior with the standard fireball model.
  • Case studies of specific GRBs (GRB 060218 and GRB 060614) to illustrate UVOT capabilities and peculiar events.
  • Integration of UVOT spectral data with Swift X-ray Telescope data.

Main Results:

  • Observed GRB afterglows exhibit a wide range of behaviors, often more complex than predicted by the simple fireball model.
  • UVOT demonstrated capabilities in tracking nearby supernova evolution, as seen with GRB 060218.
  • GRB 060614 presented an unusual case, lacking expected supernova features despite its proximity.

Conclusions:

  • The complexity of GRB afterglows necessitates refined explosion models.
  • Combined X-ray and UV/optical data are powerful tools for probing GRB environments and host galaxies.
  • UVOT plays a vital role in multi-wavelength studies of transient astrophysical phenomena.