Related Experiment Video

Updated: Jan 2, 2026

Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes
10:04

Flame Experiments at the Advanced Light Source: New Insights into Soot Formation Processes

Published on: May 26, 2014

13.2K

Mass Spectrometric Study of Photoionization. I. Apparatus and Initial Observations on Acetylene, Acetylene-d 2,

Vernon H Dibeler, Robert M Reese

    Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
    |December 14, 2019
    PubMed

    More Related Videos

    Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer07:24

    Combustion Chemistry of Fuels: Quantitative Speciation Data Obtained from an Atmospheric High-temperature Flow Reactor with Coupled Molecular-beam Mass Spectrometer

    Published on: February 19, 2018

    10.4K
    Visualization of Ambient Mass Spectrometry with the Use of Schlieren Photography06:49

    Visualization of Ambient Mass Spectrometry with the Use of Schlieren Photography

    Published on: June 20, 2016

    8.7K

    Related Concept Videos

    Mass Spectrometry: Aromatic Compound Fragmentation01:23

    Mass Spectrometry: Aromatic Compound Fragmentation

    Upon ionization, aromatic compounds generate a molecular ion that is observed as a prominent peak in their mass spectra. For example, the molecular ion peak for benzene appears at a mass-to-charge ratio of 78, while toluene is observed at a mass-to-charge ratio of 92. The molecular ion benzene is highly stable and does not readily undergo further fragmentation due to the significant amount of energy required to disrupt the aromatic stability of the benzene ring. In contrast, the molecular ion...
    2.3K
    Mass Spectrometry: Cycloalkane Fragmentation01:05

    Mass Spectrometry: Cycloalkane Fragmentation

    In mass spectrometry, cycloalkanes exhibit distinct fragmentation patterns due to the inherent stability of their molecular ions compared to linear or branched alkanes. The ring structure of cycloalkanes provides additional stability to the molecular ions, often resulting in prominent ion peaks in the mass spectrum.
    For example, cyclohexane molecular ions have a mass-to-charge ratio (m/z) of 84, which tends to produce a stronger signal than linear alkanes like hexane. This stability comes from...
    2.1K
    Mass Spectrometry: Alkyne Fragmentation00:53

    Mass Spectrometry: Alkyne Fragmentation

    The fragmentation of alkynes preferentially occurs at the carbon–carbon bond between the α and β carbon of the alkyne bond to generate a 3-propynyl cation (or propargyl cation). In terminal alkynes, there is the only type of fragmentation that yields the 3-propynyl cation. The unsubstituted 3-propynyl cation exhibits a peak at a mass-to-charge ratio of 39. In internal alkynes, the 3-propynyl cation is substituted. For example, 2-pentyne fragments into methyl-substituted 3-propynyl cation,...
    2.0K
    Mass Spectrometry: Cycloalkene Fragmentation00:54

    Mass Spectrometry: Cycloalkene Fragmentation

    The molecular ions of cycloalkenes undergo fragmentation via a retro-Diels–Alder reaction.
    1.5K
    Chemical Ionization (CI) Mass Spectrometry01:21

    Chemical Ionization (CI) Mass Spectrometry

    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...
    1.4K
    Mass Spectrometry: Branched Alkane Fragmentation01:29

    Mass Spectrometry: Branched Alkane Fragmentation

    This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
    1.6K