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Pulsed-ionization miniature ion mobility spectrometer.

Jun Xu1, W B Whitten, J M Ramsey

  • 1Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA.

Analytical Chemistry
|November 25, 2003
PubMed
Summary
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This study presents a miniature ion mobility spectrometer (IMS) using pulsed corona discharge ionization. Researchers explored ion generation mechanisms and kinetics, finding a linear relationship between ionization threshold and pulse height.

Area of Science:

  • Analytical Chemistry
  • Physical Chemistry

Background:

  • Ion mobility spectrometry (IMS) is a powerful analytical technique for identifying and quantifying compounds based on ion drift times.
  • Miniaturization of IMS instruments is crucial for portable and field-deployable applications.
  • Corona discharge is a common ionization method used in IMS, but its optimization in miniature systems requires further investigation.

Purpose of the Study:

  • To demonstrate a miniature ion mobility spectrometer (IMS) utilizing single pulses of corona discharge ionization.
  • To investigate the mechanisms and kinetics of corona discharge ionization under various conditions within the miniature IMS.
  • To analyze the influence of pulsed potential and direct current (dc) bias on ion generation.

Main Methods:

  • Development and implementation of a miniature IMS system.

Related Experiment Videos

  • Utilizing single pulses of corona discharge for ionization.
  • Measuring IMS spectra of positive and negative ions from ambient air.
  • Systematic variation of drift field, ionization conditions, and pulse widths.
  • Applying a combination of pulsed potential and steady dc bias for ion generation.

    • Main Results:

    • Successful demonstration of a miniature IMS with pulsed corona discharge ionization.
    • Acquisition of IMS spectra for both positive and negative ions under varying drift fields.
    • Detailed study of ion mobility spectra with different pulse widths, providing insights into ionization kinetics.
    • Observation of a threshold dc potential for ion generation, dependent on pulse height.
    • Discovery of a linear inverse relationship between the dc ionization threshold and pulse height.

    Conclusions:

    • The developed miniature IMS effectively employs pulsed corona discharge ionization.
    • The study elucidates key mechanisms and kinetics governing corona discharge ionization in miniature IMS.
    • The findings offer a pathway for optimizing ion generation in miniature IMS devices through controlled pulsed potentials and dc bias.