New coil geometries for the study of secondary discharge in atmospheric-pressure helium inductively coupled plasma mass spectrometry |
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| Institution: | 1. Laboratory of Plasma Physics and Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628, Japan;2. Hydrogen Isotope Research Center, University of Toyama, Gofuku 3190, Toyama 930-8555, Japan;1. School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, People’s Republic of China;2. School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, People’s Republic of China;3. Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, People’s Republic of China;1. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People’s Republic of China;2. School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, People’s Republic of China;3. Fujian Key Laboratory for Plasma and Magnetic Resonance, Department of Electronic Science, Aeronautics, School of Physics and Mechanical & Electrical Engineering, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China;1. Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan;2. Dutch Institute for Fundamental Energy Research, Nieuwegein, 3439 MN, Netherlands;3. Max-Planck-Institut für Plasmaphysik, D-85748 Garching, Germany;1. Department of Mechanical & Aerospace Engineering, University of California, Los Angeles (UCLA), 420 Westwood Plaza, Los Angeles, CA, 90095-1597, USA;2. Center for Energy Research, University of California, San Diego (UCSD), 9500 Gilman Dr, La Jolla, CA, 92093, USA;3. UltraMet, 12173 Montague St, Pacoima, CA, 91331, USA |
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| Abstract: | Several coil geometries are proposed to reduce the secondary discharge in atmospheric-pressure helium inductively coupled plasma mass spectrometry (He ICPMS) using a crystal-controlled 40-MHz generator. The effectiveness of the proposed geometries in controlling the plasma potential is investigated by the Langmuir probe method and ion kinetic energy (IKE) measurements. The influence of RF power on plasma gas temperature (Tg) is investigated through measurements of ICP-mass spectrometer interface pressure and IKEs for new and conventional coil geometries. Trends in plasma potential and Tg are well correlated, revealing that Tg is elevated (to ～3500 K) at high power levels mainly as a consequence of the interaction between the ICP and the grounded sampler. The reduction of the secondary discharge results in lower Tg values (～2600 K), necessitating the use of a membrane desolvator to remove water-related polyatomic interferences observed in the mass spectrum. Solvent removal also improves the sensitivity for bromine as a high-ionization-potential element by one order of magnitude compared to the previous studies. |
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