Journal
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
Volume 26, Issue 4, Pages 758-765Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ja00177e
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Funding
- EU through the Marie Curie Research Training Network GLADNET [MRTN-CT-2006-035459]
- STREP [STRP 032202]
- Spanish Ministry of Science and Innovation
- FEDER [MAT2007-65097-C02]
- Spanish Ministry of Education
- European Social Fund
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A new experimental set-up has been developed in order to perform spatially resolved measurements of the optical emission in a radiofrequency glow discharge (rf-GD). The emitted radiation is not only detected through an end-on window (as usually done in commercial GD-OES instruments), but the emission along the plasma plume is also measured axially-resolved by side-on measurements. The GD source is a modified Grimm-type source and follows a previous configuration designed for analytical applications in glow discharge coupled to mass spectrometry (GD-MS) instruments. Depending on the argon flow rate and pressure, and for a pure copper sample, two different plasma regimes have been observed and characterized by analyzing the spatial distribution of different excited species present in the plasma. Keeping a constant Ar flow rate, pressures higher than a certain value lead to enhanced Cu (analyte) emission (green regime) while at lower pressures a violet plasma is observed. In the violet regime, the spatial extension of Cu and Ar excited species along the plasma axis is found to be broader.
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