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Related Concept Videos

Mass Analyzers: Overview01:13

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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Tandem Mass Spectrometry

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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...
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This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
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High-Resolution Mass Spectrometry (HRMS)

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F&#8722;
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Angle-resolved neutralization-reionization mass spectrometry.

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|November 19, 2013
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Summary
This summary is machine-generated.

Neutralization-reionization mass spectra are sensitive to scattering angles, influencing reaction pathways. Higher scattering angles favor higher activation energy reactions, aiding isomeric characterization of alkenes.

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Area of Science:

  • Physical Chemistry
  • Mass Spectrometry
  • Organic Chemistry

Background:

  • Neutralization-reionization mass spectrometry is a powerful technique for studying reactive intermediates.
  • The scattering angle during the neutralization event can influence the internal energy of the resulting species.
  • Understanding factors affecting fragmentation is crucial for accurate molecular identification.

Purpose of the Study:

  • To investigate the influence of the z-axis scattering angle in neutralization-reionization mass spectrometry.
  • To determine how scattering angle affects the mass spectra of specific organic molecules, including 2-propenal, isomeric butenes, and isomeric n-hexenes.
  • To explore the utility of scattering-dependent fragmentation for isomeric characterization.

Main Methods:

  • Acquisition of neutralization-reionization mass spectra for 2-propenal, isomeric butenes, and isomeric n-hexenes.
  • Systematic variation of the z-axis scattering angle during the neutralization step.
  • Analysis of fragmentation patterns as a function of scattering angle.

Main Results:

  • Significant dependence of mass spectra on the z-axis scattering angle was observed for all studied compounds.
  • Increasing scattering angles correlated with a preference for fragmentation pathways involving higher activation energies.
  • Distinct fragmentation patterns emerged for isomeric butenes and n-hexenes at different scattering angles, facilitating differentiation.

Conclusions:

  • The z-axis scattering angle is a critical parameter in neutralization-reionization mass spectrometry, controlling internal energy deposition.
  • Exploiting scattering angle-dependent fragmentation offers a valuable strategy for the definitive isomeric characterization of organic molecules.
  • This approach enhances the analytical power of mass spectrometry for complex hydrocarbon analysis.