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KMID : 0385520090220020152
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Analytical Science & Technology
2009 Volume.22 No. 2 p.152 ~ p.158
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Development and characteristics investigation of new soft plasma ionization(SPI) source
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Lee Hiw-Won
Park Hyun-Kuk
Lee Sang-Chun
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Abstract
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In this study, we made a new discharge source improving previous SPI source to ionize softly organic compounds. The new SPI source consists of two electrodes as a hollow mesh cathode of half cylindrical shape and a hollow anode. We optimized the geometrical parameter of the SPI source by investigating the I-V curves at the various distance between the cathode and the anode. As the results, we found stable conditions of the soft plasma on broad range of the current and the voltage. The new SPI source attached to quadrupole mass spectrometer (QMS), and we obtained the mass spectra of dichloromethane (DCM). The fragment patterns of DCM appeared similarly with the pattern of electron ionization (EI).
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KEYWORD
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soft plasma ionization, glow discharge process, ionization source, plasma source mass spectrometry, organic mass spectrometry
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