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Mass Analyzers: Common Types01:19

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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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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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Modeling of a linear ion trap with driving rectangular waveforms.

A I Ivanov1, A A Sysoev2, A N Konenkov1

  • 1Ryazan State University named after S.A. Esenin, Ryazan, Russia.

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|May 10, 2024
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Summary
This summary is machine-generated.

This study details a digital linear ion trap (LIT) using resonant radial ejection for ion mass scanning. The method achieves a maximum mass-to-charge ratio of approximately 10 kDa by varying voltage pulse asymmetry.

Keywords:
digital linear ion trapion oscillation frequenciesmass rangerectangular waveformtrap acceptancetrap operating parameters

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Area of Science:

  • Physics
  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Digital linear ion traps (LITs) are crucial for mass spectrometry.
  • Resonant radial ejection is a technique used in ion traps for manipulation.
  • Optimizing ion scanning and acceptance in LITs is essential for improved performance.

Purpose of the Study:

  • To investigate the operation of a digital linear ion trap with resonant radial ejection.
  • To develop and analyze a method for ion mass scanning using voltage pulse asymmetry.
  • To calculate ion oscillation frequencies and trap acceptance for optimized mass scanning.

Main Methods:

  • Applying a sequence of rectangular voltage pulses with a dipole resonance signal to trap electrodes.
  • Utilizing a piecewise constant, zero-mean periodic waveform determined by an asymmetry parameter.
  • Performing ion mass scanning by time-varying the asymmetry parameter and negative pulse amplitude.

Main Results:

  • Calculated ion oscillation frequencies and linear trap acceptance.
  • Determined the dependence of ion mass-to-charge ratio on the asymmetry parameter.
  • Achieved a maximum mass-to-charge ratio of approximately 10 kDa with specific trap parameters and dipolar excitation frequency (0.125 MHz).

Conclusions:

  • The described method enables effective ion mass scanning in digital linear ion traps.
  • Optimizing voltage pulse parameters, particularly asymmetry, maximizes the trap's acceptance and mass scanning range.
  • This technique offers a pathway for enhanced performance in ion trap mass spectrometry.