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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).
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Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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.
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Mass Spectrometers

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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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...

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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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Sequential encoding with multislit spectrometers.

J A Decker, M O Harwitt

    Applied Optics
    |January 14, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel optical encoding method for multislit spectrometers uses sequential spectral band measurements. This approach reconstructs spectra via linear algebraic equations, avoiding Fourier transform limitations.

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    Area of Science:

    • Spectroscopy
    • Optical Engineering
    • Applied Mathematics

    Background:

    • Multislit spectrometers are crucial for spectral analysis.
    • Existing encoding methods can face limitations, particularly those based on Fourier or Fresnel transforms.

    Purpose of the Study:

    • To introduce a new method for optically encoding spectral data from multislit spectrometers.
    • To provide an alternative encoding strategy that bypasses common transform-based issues.

    Main Methods:

    • The proposed method involves sequential measurements of light intensity across selected spectral bands.
    • Encoded optical information is represented as a system of simultaneous linear algebraic equations.
    • Spectrum reconstruction is performed using matrix inversion techniques.

    Main Results:

    • The method successfully encodes spectral output without relying on Fourier or Fresnel transforms.
    • It offers a robust way to handle spectral information through linear algebraic solutions.
    • Matrix inversion provides an effective means for spectrum reconstruction.

    Conclusions:

    • This new optical encoding method offers a viable alternative for multislit spectrometers.
    • The reliance on simultaneous linear algebraic equations simplifies reconstruction and avoids transform-related complexities.
    • The technique holds potential for advancing spectral analysis applications.