The effect of OH radicals on Cr-I spectral lines emitted by DC glow discharges

P. Mezei, T. Cserfalvi, P. Hartmann, L. Bencs

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The intensity distribution of the Cr-I 428.97 nm resonant and 520.60 nm non-resonant lines was studied as a function of the distance from the anode in a low pressure DC-GD fitted with a Cr metal cathode and operated in various gas atmospheres, including helium (P = 4 mbar), ambient air and water vapor (P = 0.8 mbar). In the helium and ambient air atmospheres, the intensity peaks occurred in the near cathode region (cathode glow) in accordance with the literature. When operated in water vapor, however, the Cr-I 428.97 nm resonant line disappeared, whereas the intensity of the non-resonant 520.60 nm line was enhanced. This result may be attributed to resonant energy transfer collisions taking place between OH radicals excited to the first vibrational level and Cr*428 atoms excited to the z7P0 upper level of the 428.97 nm transition. The similar gas phase composition encountered with a DC electrolyte cathode atmospheric pressure glow discharge (ELCAD) and the Cr metal cathode GD operating under a low pressure of water vapor suggests that the zero intensity of the Cr resonance lines (428.97 nm, 360.53 nm) produced in the ELCAD may be attributed to similar energy transfer processes. Our results show that the intensity of the Cr-I 520.60 nm line can be used for analytical purposes in the ELCAD.

Original languageEnglish
Pages (from-to)218-224
Number of pages7
JournalSpectrochimica Acta - Part B Atomic Spectroscopy
Volume65
Issue number3
DOIs
Publication statusPublished - Mar 2010

Fingerprint

Glow discharges
glow discharges
line spectra
Cathodes
cathodes
direct current
Steam
water vapor
atmospheric pressure
Water vapor
Electrolytes
Atmospheric pressure
electrolytes
Helium
Energy transfer
low pressure
cathode glow
energy transfer
helium
Gases

Keywords

  • Atmospheric glow discharge
  • Atomic emission spectroscopy
  • Electrolyte cathode

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Spectroscopy

Cite this

The effect of OH radicals on Cr-I spectral lines emitted by DC glow discharges. / Mezei, P.; Cserfalvi, T.; Hartmann, P.; Bencs, L.

In: Spectrochimica Acta - Part B Atomic Spectroscopy, Vol. 65, No. 3, 03.2010, p. 218-224.

Research output: Contribution to journalArticle

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AB - The intensity distribution of the Cr-I 428.97 nm resonant and 520.60 nm non-resonant lines was studied as a function of the distance from the anode in a low pressure DC-GD fitted with a Cr metal cathode and operated in various gas atmospheres, including helium (P = 4 mbar), ambient air and water vapor (P = 0.8 mbar). In the helium and ambient air atmospheres, the intensity peaks occurred in the near cathode region (cathode glow) in accordance with the literature. When operated in water vapor, however, the Cr-I 428.97 nm resonant line disappeared, whereas the intensity of the non-resonant 520.60 nm line was enhanced. This result may be attributed to resonant energy transfer collisions taking place between OH radicals excited to the first vibrational level and Cr*428 atoms excited to the z7P0 upper level of the 428.97 nm transition. The similar gas phase composition encountered with a DC electrolyte cathode atmospheric pressure glow discharge (ELCAD) and the Cr metal cathode GD operating under a low pressure of water vapor suggests that the zero intensity of the Cr resonance lines (428.97 nm, 360.53 nm) produced in the ELCAD may be attributed to similar energy transfer processes. Our results show that the intensity of the Cr-I 520.60 nm line can be used for analytical purposes in the ELCAD.

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