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Soft Argon-Propane Dielectric Barrier Discharge Ionization.

Alexander Schütz1, Felipe J Lara-Ortega2, Felix David Klute1

  • 1Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V. , Bunsen-Kirchhoff-Straße 11 , 44139 Dortmund , Germany.

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|February 21, 2018
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This study introduces a novel argon-based dielectric barrier discharge (DBD) for soft ionization mass spectrometry (MS). By using propane as an ignition aid and an enclosed system, homogeneous plasma and improved analyte introduction are achieved, advancing DBD-MS applications.

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Area of Science:

  • Analytical Chemistry
  • Plasma Physics

Background:

  • Dielectric barrier discharges (DBDs) are established soft ionization sources for mass spectrometry (MS).
  • Helium-based DBDs offer good ionization efficiency and stable plasma but argon-based DBDs require higher voltages and can produce filamentary plasma.
  • Argon metastables do not efficiently ionize nitrogen impurities, unlike helium.

Purpose of the Study:

  • To develop a homogeneous argon-based dielectric barrier discharge ionization (DBDI) source.
  • To reduce ignition and working voltages for argon-based DBDI.
  • To improve analyte introduction for nonambient DBDI-MS.

Main Methods:

  • Utilized a mixture of argon and propane (C3H8) as an ignition aid for homogeneous plasma generation.
  • Introduced analytes into an enclosed system through the discharge capillary.
  • Characterized the nonambient DBDI-MS arrangement.

Main Results:

  • Propane addition enabled Penning ionization by argon metastables, leading to homogeneous argon-based DBDI.
  • Achieved lower ignition and working voltages compared to traditional argon DBDs.
  • Demonstrated a novel enclosed system for analyte introduction, enhancing interaction with reactant ions.

Conclusions:

  • Homogeneous argon-based DBDI is feasible using propane as an ignition aid.
  • The nonambient DBDI-MS setup enhances analyte ionization efficiency.
  • This approach paves the way for integrating DBDI with separation techniques like GC and HPLC.