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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 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 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 Spectroscopy: Beer–Lambert Law01:09

UV–Vis Spectroscopy: Beer–Lambert Law

The Beer-Lambert law describes the relationship between absorbance and concentration, which combines the principles established by scientists Johann Heinrich Lambert and August Beer. Lambert's law states that when light passes through a medium, the loss in intensity is directly proportional to the original intensity and the path length of the light. Beer's law proposed that the transmittance of a solution remains constant if the product of concentration and path length is constant. The modern...
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)...
Flame Photometry: Lab01:16

Flame Photometry: Lab

In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...

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Related Experiment Video

Updated: Jun 17, 2026

Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Ultraviolet measurements in planetary atmospheres.

W G Fastie1

  • 1The Johns Hopkins University, Baltimore,Maryland 21218, USA.

Applied Optics
|January 9, 2010
PubMed
Summary

Advancements in optical and electronic components enhance far ultraviolet rocket spectrophotometry, enabling the measurement of weaker spectral features in the 1100-3000 Angstrom range.

Area of Science:

  • Aerospace Engineering
  • Spectroscopy
  • Atmospheric Physics

Background:

  • Far ultraviolet (FUV) spectrophotometry is crucial for studying atmospheric phenomena.
  • Previous limitations in optical and electronic components hindered detailed FUV spectral analysis.

Purpose of the Study:

  • To discuss the impact of new optical and electronic components on FUV rocket spectrophotometry.
  • To review recent experimental results from Earth's airglow and aurorae studies.

Main Methods:

  • Review of recent experimental data from FUV spectrophotometry.
  • Analysis of the performance of advanced optical and electronic components in FUV spectroscopy.

Main Results:

  • New components significantly improve FUV rocket spectrophotometry capabilities.

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Last Updated: Jun 17, 2026

Scattering And Absorption of Light in Planetary Regoliths
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Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer
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  • Weaker spectral features in the 1100-3000 Angstrom range are measurable with greater sensitivity.
  • Conclusions:

    • Latest component developments offer unprecedented opportunities for FUV atmospheric research.
    • Enhanced FUV spectrophotometry will lead to a deeper understanding of Earth's airglow and aurorae.