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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

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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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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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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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¹H NMR: Complex Splitting01:13

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Modeling dipolar excitation for quadrupole mass filter.

A N Konenkov1, N V Konenkov1,2, A A Sysoev2,3,4

  • 1Physics and Mathematics Department, 275285Ryazan State University, Ryazan, Russia.

European Journal of Mass Spectrometry (Chichester, England)
|March 31, 2022
PubMed
Summary
This summary is machine-generated.

Modeling AC and DC dipole excitation in quadrupole mass filters reveals control over ion oscillations. AC excitation allows tuning mass filter resolution and enabling mass-selective excitation in ion traps.

Keywords:
DC and AC dipolar excitationdipolar potential amplitude and phaseinstability bandsmass peak shapequadrupole mass filterresolving powertransmission contour

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Mass Spectrometry

Background:

  • Quadrupole mass filters (QMFs) are essential for mass analysis.
  • Understanding ion dynamics under external AC and DC fields is crucial for optimizing QMF performance.
  • Ion oscillations in QMFs are influenced by dipole excitation, affecting separation and detection.

Purpose of the Study:

  • To model and analyze the effects of AC and DC dipole excitation on ion oscillations within a QMF.
  • To investigate the impact of AC excitation parameters on QMF resolution and mass selectivity.
  • To explore the combined use of AC and DC excitation for shaping mass peaks.

Main Methods:

  • Numerical integration of ion motion equations.
  • Simulation of ion trajectories with normally distributed initial coordinates and velocities.
  • Analysis of ion stability diagrams and transmission contours.

Main Results:

  • AC dipole excitation leads to instability bands on the (a, q) stability diagram, forming dips in the transmission contour.
  • AC excitation at frequency Ω/2 enables control over QMF resolution by adjusting AC amplitude or phase.
  • Instability bands can be leveraged for mass-selective excitation in linear ion traps.

Conclusions:

  • AC and DC dipole excitation offer tunable control over ion behavior in QMFs.
  • AC excitation provides a method to enhance mass filter resolution and selectivity.
  • The findings support the application of these excitation techniques for advanced mass spectrometry applications.