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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,...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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.
One of the factors influencing λmax is the extent of conjugation in the...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...

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

Vacuum Ultraviolet High Resolution Spectroscopy Using a BRV Continuum Source.

E Boursey, H Damany

    Applied Optics
    |February 4, 2010
    PubMed
    Summary

    Researchers improved a Ballofet-Romand-Vodar continuum source with better spark synchronization and anode cooling. This enhanced performance allows for high-resolution absorption spectra, demonstrating the updated instrument

    Area of Science:

    • Spectroscopy
    • Atomic Physics
    • Instrumental Development

    Background:

    • Continuum sources are essential for absorption spectroscopy.
    • Previous Ballofet-Romand-Vodar continuum sources had limitations in performance.
    • High-resolution spectral analysis requires stable and intense light sources.

    Purpose of the Study:

    • To present key improvements to the Ballofet-Romand-Vodar continuum source.
    • To demonstrate the enhanced performance of the modified continuum source.
    • To showcase the utility of the improved source for high-resolution spectroscopy.

    Main Methods:

    • Implemented accurate synchronization of the main spark discharge.
    • Enhanced the cooling system for the anode.
    • Utilized a 10-m concave grating spectrograph for spectral analysis.

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

    High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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    High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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    Main Results:

    • Achieved improved stability and performance of the continuum source.
    • Obtained high-resolution absorption spectra.
    • Demonstrated the effectiveness of the implemented modifications.

    Conclusions:

    • The modifications significantly enhance the capabilities of the Ballofet-Romand-Vodar continuum source.
    • The improved source is suitable for demanding high-resolution spectroscopic applications.
    • Further research can leverage this enhanced instrumental performance.