Quantitative analysis of trace N2, Ar in O2 using glow discharge optical emission spectroscopy.
Rev Sci Instrum
; 93(6): 065105, 2022 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-35778013
ABSTRACT
A trace level of N2 and Ar gases in O2 ambience were quantitatively analyzed for the first time by glow discharge optical emission spectroscopy. Microplasma was generated in a compact gas cell by a metal (Au) electrode pair of 1 mm diameter and â¼1 mm separation with the driving voltage of â¼0.9 kV and the current of â¼5 mA in â¼60 Torr. 358 and 813 nm optical emission bands were used for N2 and Ar detection, respectively. A spectroscopy fiber bundle having a circular input cross section of â¼700 µm in diameter and an output of 100 µm in width and 3 mm in height was employed to promote the signal collection efficiency while preserving high spectral resolution. As a result, the detection sensitivities <1 ppm (3 - σ) were attained for both N2 and Ar within 10 s. The detection accuracy was also promoted by correcting the N2 and Ar band signal intensities using the neighboring O emission band intensities, which led to detection errors <2% (3 - σ) for both N2 and Ar.
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01-internacional
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MEDLINE
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Metais
Idioma:
En
Revista:
Rev Sci Instrum
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Coréia do Sul