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Related Concept Videos

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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In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Low fragment polyatomic molecular ion source by using permanent magnets.

Mitsuaki Takeuchi1, Kyouhei Hayashi1, Kousuke Imanaka1

  • 1Photonics and Electronics Science and Engineering Center, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.

The Review of Scientific Instruments
|March 6, 2014
PubMed
Summary

A novel electron-ionization ion source using Sm-Co magnets enhances molecular ion intensity by four times. This design suppresses fragment ions by increasing low-energy electrons through magnetic confinement.

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Area of Science:

  • Analytical Chemistry
  • Physics
  • Materials Science

Background:

  • Developing efficient ion sources is crucial for mass spectrometry.
  • Polyatomic molecular ion sources often suffer from excessive fragmentation.
  • Existing electron ionization methods can lead to undesirable fragment ions.

Purpose of the Study:

  • To develop an electron-ionization-type polyatomic molecular ion source with suppressed fragment ions.
  • To enhance the intensity of molecular ions using magnetic confinement.
  • To investigate the effect of electron confinement on fragmentation patterns.

Main Methods:

  • Utilized a pair of ring-shaped samarium-cobalt (Sm-Co) magnets for electron confinement.
  • Designed the magnets to be placed on the forward and backward sides of the ionization part.
  • Calculated electron trajectories to compare with ordinary configurations.
  • Analyzed mass spectra of n-tetradecane (C14H30) to assess ion intensity and fragmentation.

Main Results:

  • The developed ion source demonstrated a 20-fold increase in calculated electron trajectory length compared to ordinary configurations.
  • Mass spectra showed a four-fold larger intensity for molecular ions (mass/charge 93-210 u) from n-tetradecane.
  • Observed suppression of fragment ions, attributed to an increase in low-energy electrons.

Conclusions:

  • The Sm-Co magnet configuration effectively confines electrons, enhancing molecular ion generation.
  • The developed ion source offers improved performance for analyzing polyatomic molecules with reduced fragmentation.
  • This magnetic confinement technique presents a viable strategy for optimizing electron ionization sources.