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Characterization of a Low-Temperature Plasma (LTP) Ambient Ionization Source Using Temporally Resolved Monochromatic
George C-Y Chan1,2, Carsten Engelhard1,3, Joshua S Wiley4
1Department of Chemistry, Indiana University, Bloomington, IN, USA.
Applied Spectroscopy
|August 21, 2023
Summary
This study visualizes low-temperature plasma (LTP) jet species using 2D imaging, revealing transient plasma bullet behavior and interactions with surfaces. These findings enhance understanding for improved analyte ion sampling in LTP mass spectrometry (MS).
Area of Science:
- Plasma Physics
- Mass Spectrometry
- Optical Spectroscopy
Background:
- Low-temperature plasma (LTP) probes are common in ambient desorption-ionization mass spectrometry (MS).
- While LTP probes are well-characterized by MS, optical spectroscopy studies are less common.
- Understanding LTP plasma jet dynamics is crucial for optimizing MS performance.
Purpose of the Study:
- To visualize key species within the LTP plasma jet using two-dimensional (2D) imaging.
- To investigate the temporal and spatial dynamics of LTP emissions, including transient behaviors.
- To study the interaction of the LTP probe with sample substrates and external electrical components.
Main Methods:
- Recorded 2D steady-state images of LTP emissions for N2+, He I, and N2 at specific wavelengths.
- Utilized time-resolved 2D imaging with a 200 ns detection gate to map transient plasma species.
- Correlated optical emission spectra with mass spectrometry data and analyzed LTP operating parameter effects.
Main Results:
- Observed transient 'plasma bullet' behavior in He I, N2+, and N2 emissions, lasting microseconds.
- Found high spatial and temporal correlation between N2+ and He I emissions.
- Demonstrated that a grounded needle extends plasma jet lifetime and influences discharge dynamics.
Conclusions:
- Temporally and spatially resolved imaging provides critical insights into LTP plasma jet processes.
- Understanding these dynamics, including transient behaviors and interactions, is key to improving analyte ion sampling in LTP-MS.
- Optical spectroscopy complements MS characterization for a more comprehensive understanding of LTP sources.
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