Bias-current modulation technique of a radio-frequency glow discharge plasma for atomic emission analysis associated with a fast Fourier transform analyzer

Kazuaki Wagatsuma, Satomi Urushibata

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

A measuring method using a fast Fourier transform (FFT) analyzer is suggested to estimate the emission intensity from a radio-frequency (RF)-powered glow discharge plasma for atomic emission analysis. The FFT analyzer has an ability to disperse the components by frequency from an overall signal, and thus works as a selective detector in modulation spectroscopy. In the RF glow discharge plasma, a dc bias current can be introduced by connecting an external electric circuit with the discharge lamp, which predominantly enhances the emission intensities. Further, the bias current can be pulsated with a switching device to modulate the emission intensities, and then the modulated component was selectively detected with the FFT analyzer. This method greatly improved the data precision. The emission intensity of the Cu I 324.75-nm line in an Fe-based alloy sample containing 0.043 mass% Cu could be estimated with a relative standard deviation of 0.20%. The 3σ detection limits of Cu in Fe-based alloys could be obtained to be 2.3 × 10- 6 mass% Cu for Cu I 324.75 nm and 6.8 × 10- 6 mass% Cu for Cu I 327.40 nm.

Original languageEnglish
Pages (from-to)107-112
Number of pages6
JournalMicrochemical Journal
Volume95
Issue number1
DOIs
Publication statusPublished - 2010 May

Keywords

  • Bias-current modulation
  • Copper
  • Fast Fourier transform analyzer
  • Glow discharge plasma
  • Iron-based alloy
  • Optical emission spectrometry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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