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- W2023995738 abstract "The possibility of suppressing gas species in direct current glow discharge mass spectrometry (dc-GDMS) with a linear time-of-flight mass analyzer was investigated. With this dc-GD ion source, a ‘clean’ mass spectrum rich in analyte could be obtained when the dc-GD was operated under a discharge current of 15–30 mA and a gas pressure of 300–500 Pa, in contrast to the strong signals of gas species in conventional dc-GDMS, which operates at lower currents and pressures (typically 1–5 mA and 100 Pa). Such an experimental result is believed to be due to increased sputtering at higher pressures and currents, and the different ionization mechanisms of analyte and gas species. For a possible GD design to eliminate the background gas ions, a new discharge configuration was developed by attaching a TM 010 microwave resonator to the GD ion source. The mass spectrum of the cathode sample showed a low gas species background when the microwave-induced plasma (MIP) discharge was ‘off’ under different dc-GD parameters. The mass spectra of analyte and gas species obtained with ‘MIP+dc-GD’ and ‘MIP only’ modes are also compared and discussed. It was found that the analyte signals decrease and the gas species signals increase in the presence of the MIP, and that the analyte signals nearly disappear in the ‘MIP only’ mode. Preliminary results suggest that, for specific discharge conditions and with a suitable design of the GD source, an efficient suppression of gas species in dc-GDMS detection could be realized." @default.
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- W2023995738 date "1998-01-01" @default.
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- W2023995738 title "Suppression of gas species signals in direct current glow discharge time-of-flight mass spectrometry" @default.
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