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Updated: Jun 1, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

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Time-of-Flight Mass Spectrometry with a Pulsed Glow Discharge Ionization Source.

R E Steiner¹, C L Lewis, F L King

¹Department of Chemistry, West Virginia University, Morgantown, West Virginia 26506-6045.

Analytical Chemistry

|June 7, 2011

Summary

This summary is machine-generated.

Optimizing pulsed glow discharge with time-of-flight mass spectrometry (GD-TOFMS) using a slit improves trace element analysis. A 1.0 mm slit width balances resolution and isotope accuracy for enhanced sensitivity.

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Published on: January 9, 2014

Area of Science:

Analytical Chemistry
Plasma Physics
Mass Spectrometry

Background:

Pulsed glow discharge (GD) plasma sources are suitable for time-of-flight mass spectrometry (TOFMS).
Direct trace element determination in solid samples benefits from pulsed GD-TOFMS.
Initial GD-TOFMS systems showed limitations in resolution.

Purpose of the Study:

To optimize pulsed GD-TOFMS for trace element analysis.
To investigate the impact of slit width on TOFMS performance.
To determine optimal operating conditions for improved resolution and isotope accuracy.

Main Methods:

Utilized a pulsed glow discharge (GD) plasma source coupled with time-of-flight mass spectrometry (TOFMS).
Introduced a slit to narrow the ion beam entering the TOFMS extraction region.
Investigated the influence of varying slit widths (specifically 1.0 mm) on TOFMS performance.

Main Results:

A slit width of 1.0 mm was identified as optimal, balancing resolution and isotope ratio accuracy.
Pulsed GD-TOFMS demonstrated enhanced sensitivity and selectivity through Penning ionization.
Sampling in the 'afterpeak' regime eliminated electron-ionized interferences and detector saturation.

Conclusions:

Optimized pulsed GD-TOFMS, particularly with a 1.0 mm slit, offers superior direct trace element determination in solids.
The technique provides improved sensitivity and selectivity by leveraging Penning ionization.
Afterpeak sampling in GD-TOFMS ensures mass spectra free from electron-ionization interferences.