Effect of the plasma operating frequency on the figures of merit of an inductively coupled plasma time-of-flight mass spectrometer
Literature Information
Denise M. McClenathan, William C. Wetzel, Susan E. Lorge, Gary M. Hieftje
The analytical characteristics of a 27.12 MHz and a 40.68 MHz inductively coupled plasma time-of-flight mass spectrometer were evaluated under both hot and cool plasma conditions. The study was both direct and unambiguous because the same power supply, impedance-matching unit, load coil, and ICP torch were used at both operating frequencies. Although there are significant differences in the figures of merit between hot and cool plasma conditions, the performance at 27 MHz and 40 MHz was comparable. Under hot plasma conditions, measured ion energies and the plasma offset potential were nearly independent of the generator frequency. Higher ion energies and a greater plasma offset potential were apparent at 27 MHz under cold plasma conditions than at 40 MHz; however, this result may be an artifact of the difference in the optimal nebulizer flow rate rather than of frequency. Experimentally determined gas-kinetic and ionization temperatures did not demonstrate a significant frequency dependence.
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Journal of Analytical Atomic Spectrometry

The Journal of Analytical Atomic Spectrometry (JAAS) is the central journal for publishing innovative research on fundamentals, instrumentation, and methods in the determination, speciation and isotopic analysis of (trace) elements within all fields of application. This includes, but is not restricted to, the most recent progress, developments and achievements in all forms of atomic and elemental detection, isotope ratio determination, molecular analysis, plasma-based analysis and X-ray techniques. The journal welcomes full papers, communications, technical notes, critical and tutorial review articles, editorials, and comments, in addition to the Atomic Spectrometry Updates (ASU) literature reviews that are prepared by an expert panel. Submissions are welcome in the following areas, but note this list reflects the current scope and authors are strongly encouraged to contact the Editorial team if they believe that their work offers potentially new and emerging research relevant to the journal remit: Fundamental studies in the following. New and existing sources for atomic emission, absorption, fluorescence and mass spectrometry and those that provide both atomic and molecular information Sample introduction techniques for solids, liquids, gases Improvements in sensitivity, selectivity, precision, accuracy and/or robustness Isotope ratio measurements, including techniques for improving precision and mass bias correction Single channel and multichannel simultaneous detection systems Chemometrics, statistics, calibration techniques and internal standardisation Theoretical and numerical modelling of fundamental processes related to all of the above methodologies Novel or improved methodologies in areas of application including, but not limited to the following. Biosciences, including elemental, speciation and isotopic analysis in biological systems, immunoassays based on metal-labeled antibodies, bio-imaging, and nanoparticle toxicology Geochemistry Environmental science Materials science, including engineered nanoparticles and quantum dots Metrology, including reference materials Forensic analysis Food and agricultural sciences Energy Archaeometry Molecular analysis. Molecular sources for elemental and isotopic analysis Atomic sources for molecular analysis Atomic and molecular techniques simultaneously used for complementary chemical information All contributions are judged on originality and quality of scientific content, and appropriateness of length to content of new science.













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