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Related Concept Videos

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...
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...
IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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,...

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Related Experiment Video

Updated: Jun 16, 2026

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

Vacuum ultraviolet 6-m monochromator.

J H Carver, G N Haddad, T I Hobbs

    Applied Optics
    |February 23, 2010
    PubMed
    Summary
    This summary is machine-generated.

    We designed and built the Adelaide 6.65-m Vacuum Ultraviolet (VUV) monochromator for high-resolution atmospheric gas studies. Its advanced digital control system ensures precise wavelength and focusing adjustments for accurate photoabsorption measurements.

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    Area of Science:

    • Spectroscopy
    • Atmospheric Science
    • Optical Instrumentation

    Background:

    • High-resolution VUV spectroscopy is crucial for understanding atmospheric gas photoabsorption.
    • Existing monochromator designs may lack the precision required for detailed atmospheric studies.

    Purpose of the Study:

    • To describe the design and construction of the Adelaide 6.65-m VUV monochromator.
    • To detail its capabilities for high-resolution photoabsorption studies.
    • To demonstrate its performance using molecular oxygen absorption.

    Main Methods:

    • Utilized an off-plane Eagle mounting for the VUV monochromator.
    • Implemented digital encoders for precise monitoring of grating angular rotation and linear displacement.
    • Employed servocontrolled, electronically coupled wavelength and focusing adjustments operated via a programmable calculator.

    Main Results:

    • The Adelaide 6.65-m VUV monochromator was successfully designed and constructed.
    • The instrument operates in the first order across a wavelength range up to 460 nm.
    • Performance was validated through high-resolution absorption studies of molecular oxygen's Schumann-Runge band system.

    Conclusions:

    • The Adelaide 6.65-m VUV monochromator is a capable instrument for high-resolution photoabsorption studies.
    • Its digital control system provides accurate and reliable wavelength and focusing adjustments.
    • The demonstrated performance confirms its utility for atmospheric gas research.