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Issue 7, 2011

Spectroscopic plasma diagnostics on a low-temperature plasma probe for ambient mass spectrometry

Author affiliations

Abstract

Since the inception of ambient desorption/ionization mass spectrometry, plasma ionization sources have played an increasing role in molecular mass spectrometry. Although a variety of discharge designs and geometries, along with a range of applications, have been introduced, very little published work has focused on the characterization and fundamental examination of these discharges, especially on the desorption/ionization processes they employ. In the present work, a simple yet effective ambient desorption/ionization source based on a dielectric-barrier discharge, the low-temperature plasma (LTP) probe, was optically characterized. By means of a spatially selective detection system, maps of reactive species created in both the plasma and the afterglow regions were recorded. From these maps, the origin of impurities important in mass spectrometric analyses, such as H2O, N2, and O2, was deduced. Electron number densities and rotational temperatures for the LTP were found to be similar to those reported for other dielectric-barrier discharges. Lastly, the effect of plasma parameters on emission spectra was correlated with mass spectral results previously reported for the same ionization source.

Graphical abstract: Spectroscopic plasma diagnostics on a low-temperature plasma probe for ambient mass spectrometry

Article information


Submitted
08 Dec 2010
Accepted
07 Apr 2011
First published
28 Apr 2011

J. Anal. At. Spectrom., 2011,26, 1434-1444
Article type
Paper

Spectroscopic plasma diagnostics on a low-temperature plasma probe for ambient mass spectrometry

G. C.-Y. Chan, J. T. Shelley, A. U. Jackson, J. S. Wiley, C. Engelhard, R. G. Cooks and G. M. Hieftje, J. Anal. At. Spectrom., 2011, 26, 1434 DOI: 10.1039/C0JA00230E

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