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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...
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.
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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.

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
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Published on: October 23, 2018

Photoelectron spectroscopy with undispersed ultraviolet radiation.

R B Cairns, H Harrison, R I Schoen

    Applied Optics
    |January 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Minority emissions in rare gas UV radiation sources can distort photoelectron spectra. Zeolite gas trapping effectively cleans these spectra, improving accuracy for observing states like NO(+) and Hg(+).

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    Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
    08:53

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    Published on: October 9, 2012

    Area of Science:

    • Atomic and Molecular Physics
    • Spectroscopy
    • Radiation Science

    Background:

    • Photoelectron spectroscopy is sensitive to spectral interferences.
    • Rare gas resonance line UV sources can produce unwanted minority emissions.
    • These emissions can complicate the interpretation of observed ionic states.

    Purpose of the Study:

    • To identify the source of unwanted effects in photoelectron spectra.
    • To investigate the role of minority emissions in rare gas UV sources.
    • To demonstrate a method for spectral cleanup.

    Main Methods:

    • Analysis of photoelectron spectra from various rare gas UV sources.
    • Characterization of minority emission lines.
    • Application of zeolite gas trapping for spectral purification.

    Main Results:

    • Minority emissions were identified as a cause of spectral artifacts.
    • These emissions were linked to observed states of NO(+) and Hg(+).
    • Zeolite gas trapping significantly improved spectral quality.

    Conclusions:

    • Minority emissions in rare gas UV sources are a significant source of error in photoelectron spectroscopy.
    • Zeolite gas trapping is an effective technique for mitigating these spectral artifacts.
    • Improved spectral data aids in the accurate determination of ionic states.