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Related Concept Videos

Mass Spectrum01:23

Mass Spectrum

3.9K
A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
3.9K
Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

1.4K
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Mass Spectrometry: Isotope Effect01:13

Mass Spectrometry: Isotope Effect

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Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the mass differences between isotopes. Furthermore, the intensity of these signals is dependent on the...
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Related Experiment Video

Updated: Jan 8, 2026

Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS
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Preparation of Authigenic Pyrite from Methane-bearing Sediments for In Situ Sulfur Isotope Analysis Using SIMS

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LITES-based methane isotope ratio measurement and source attribution.

Yifan Chen, Ruyue Cui, Jialiang Dai

    Optics Express
    |December 19, 2025
    PubMed
    Summary

    This study introduces a new compact system for methane isotope detection using light-induced thermoelastic spectroscopy (LITES). The technology accurately measures methane isotopes, enabling reliable source identification with improved signal quality.

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    Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

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    Area of Science:

    • Analytical Chemistry
    • Spectroscopy
    • Environmental Science

    Background:

    • Methane (CH4) isotope analysis is crucial for source identification.
    • Existing methods for isotope analysis can be complex and power-intensive.
    • There is a need for portable, low-power, in situ monitoring solutions.

    Purpose of the Study:

    • To apply light-induced thermoelastic spectroscopy (LITES) for methane isotope detection.
    • To develop a compact, low-power system for simultaneous measurement of 13CH4 and 12CH4 concentrations and their ratio.
    • To validate the system's performance against established high-precision methods.

    Main Methods:

    • Utilized light-induced thermoelastic spectroscopy (LITES) targeting near-infrared absorption lines of 13CH4 and 12CH4.
    • Implemented Kalman filtering for simultaneous measurement and improved signal-to-noise ratio.
    • Validated the system using chemically synthesized methane and biogas samples.

    Main Results:

    • Achieved simultaneous measurement of absolute concentrations and isotopic abundance ratio of methane isotopologues.
    • Demonstrated excellent agreement between LITES-derived isotopic ratios and high-precision mass spectrometry.
    • Successfully discriminated methane sources using the developed system.

    Conclusions:

    • Established LITES as a viable technique for methane isotope detection.
    • The developed system is compact, low-power, and suitable for in situ monitoring.
    • LITES offers a promising approach for portable and reliable isotope analysis.