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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...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
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 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: 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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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Published on: October 9, 2012

Extreme ultraviolet spectrometer for space research.

S Kumar, F Paresce, S Bowyer

    Applied Optics
    |February 4, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Scientists developed a new spectrometer to detect extreme ultraviolet (UV) radiation. This instrument captured the night sky

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    Area of Science:

    • Astrophysics and Space Science
    • Spectroscopy
    • Ultraviolet Astronomy

    Background:

    • The extreme ultraviolet (EUV) spectrum is crucial for understanding astrophysical phenomena.
    • Previous instruments had limitations in sensitivity and spectral range for EUV observations.
    • Accurate measurement of the night sky's EUV emissions requires specialized instrumentation.

    Purpose of the Study:

    • To develop and calibrate a novel normal incidence spectrometer for extreme ultraviolet (EUV) detection.
    • To characterize the performance of the spectrometer, including spectral and spatial resolution.
    • To obtain and present data on the extreme ultraviolet night sky spectrum.

    Main Methods:

    • Designed and constructed a normal incidence spectrometer for the 200 Å to 1270 Å wavelength range.
    • Detailed calibration procedures were performed to ensure instrument accuracy.
    • The spectrometer was deployed on a rocket flight for in-situ measurements of the night sky.

    Main Results:

    • The developed spectrometer successfully operates in the extreme ultraviolet (EUV) region.
    • It achieves a spectral resolution of 40 Å and a spatial resolution of 6 degrees.
    • The instrument detected extreme UV radiation at a minimum flux level of 1 Rayleigh.
    • The extreme UV night sky spectrum between 780 Å and 1270 Å was successfully recorded.

    Conclusions:

    • The newly developed normal incidence spectrometer is a capable instrument for extreme ultraviolet (EUV) astronomy.
    • The instrument's performance meets the requirements for detecting faint EUV emissions from the night sky.
    • The obtained spectral data provide valuable insights into the composition and dynamics of the Earth's upper atmosphere and near-space environment.