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Related Concept Videos

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.
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 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: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...

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Updated: Jun 8, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Published on: December 30, 2025

Imaging Fabry-Perot spectrometer for twilight observations.

F Bahsoun-Hamade, R H Wiens, A Moise

    Applied Optics
    |September 24, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A new ground-based spectrometer measures twilight thermospheric photochemistry, specifically the atomic oxygen emission. This instrument successfully quantified oxygen emissions, providing valuable data for atmospheric studies.

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    Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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    Published on: June 27, 2014

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    Last Updated: Jun 8, 2026

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    10:03

    Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

    Published on: June 27, 2014

    Area of Science:

    • Atmospheric Physics
    • Spectroscopy
    • Aeronomy

    Background:

    • Thermospheric photochemistry influences Earth's upper atmosphere.
    • Measuring specific atmospheric emissions is crucial for understanding these processes.
    • Ground-based observations are vital for continuous atmospheric monitoring.

    Purpose of the Study:

    • To develop and test an imaging Fabry-Perot spectrometer for ground-based twilight measurements.
    • To measure the atomic oxygen (O I) 844.6-nm emission in the thermosphere.
    • To validate a data-reduction technique for analyzing faint atmospheric emissions.

    Main Methods:

    • Utilized a narrow-band interference filter and a stabilized étalon with fixed-plate separation.
    • Employed a 512 × 512 pixel bare CCD detector for imaging.
    • Applied a least-squares data-reduction technique to isolate emission features.

    Main Results:

    • The spectrometer achieved a narrow bandpass of 0.02 nm.
    • Successfully measured the atomic oxygen O I 844.6-nm emission.
    • Obtained slant column emission rates ranging from 600 to 130 Rayleighs.

    Conclusions:

    • The developed imaging spectrometer is effective for ground-based thermospheric studies.
    • The least-squares method is suitable for extracting target emission features.
    • The instrument provides quantitative data on atomic oxygen emissions in the twilight thermosphere.