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Chemical Ionization (CI) Mass Spectrometry01:21

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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...
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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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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
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Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
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Electron energy distribution function by using probe method in electron cyclotron resonance multicharged ion source.

Sho Kumakura1, Yosuke Kurisu1, Daiju Kimura1

  • 1Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan.

The Review of Scientific Instruments
|March 6, 2014
PubMed
Summary
This summary is machine-generated.

We measured the electron energy distribution function in electron cyclotron resonance ion sources at low pressures. Higher pressures lead to higher energy electrons, impacting ion source performance.

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Area of Science:

  • Plasma Physics
  • Atomic and Molecular Physics
  • Ion Source Technology

Background:

  • Electron cyclotron resonance ion sources (ECRIS) are crucial for generating multicharged ions.
  • High-energy electrons within ECRIS plasma significantly influence plasma properties and ion generation.
  • Understanding electron energy distribution is key to optimizing ECRIS performance.

Purpose of the Study:

  • To measure the electron energy distribution function (EEDF) in the low-energy region (≤100 eV) of ECRIS plasma.
  • To investigate the influence of extremely low pressures (10⁻³–10⁻⁵ Pa) on the EEDF.
  • To correlate EEDF characteristics with plasma density and temperature.

Main Methods:

  • Utilized a cylindrical Langmuir probe for in-situ measurement of EEDF.
  • Conducted experiments at ultra-low pressures relevant to ECRIS operation.
  • Employed conventional probe analysis to determine electron density and temperature.

Main Results:

  • Established a correlation between the EEDF and plasma electron density and temperature.
  • Observed that the EEDF tail extends to higher energies as pressure increases.
  • Confirmed the presence of high-energy electrons within the ECRIS plasma.

Conclusions:

  • The EEDF in ECRIS plasma is pressure-dependent, with higher pressures broadening the high-energy tail.
  • Experimentally determined effective electron temperatures derived from EEDF exceed those from conventional probe methods.
  • These findings provide critical insights for enhancing multicharged ion production in ECRIS.