Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Laser Induced Impedance Changes in Hollow Cathode Lamps

  • Byung Chul Cha (Department of Chemistry, Seoul National University) ;
  • Jae Jung Lee (Department of Chemistry, Seoul National University) ;
  • Ki Beom Lee (Department of Chemistry, Seoul National University) ;
  • Hyo Jin Kim (Department of Phamacy, Dong Duck Women's University) ;
  • Gae Ho Lee (Department of Chemistry, Chungnam National University) ;
  • Hasuck Kim (Department of Chemistry, Seoul National University)
  • Published : 1993.10.20
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Abstract

Laser induced impedance changes in hollow cathode lamps containing sputtered metal atoms have been employed to measure the spectroscopic properties of metal. This technique, known as optogalvanic spectroscopy, has been shown to be a powerful and inexpensive technique for the investigation of atomic and molecular species. Characteristic optogalvanic signals from hollow cathode lamps (HCL) made of different metal species and induced with a pulsed dye laser were observed, and the dependence of the optogalvanic signal on the discharge current and wavelength of laser was measured. Based on the results obtained, the mechanisms involved in evoking the optogalvanic signals were consisted of single-photon absorption, multi-photon absorption, and photoionization. Moreover the current dependence of the optogalvanic signal indicates that the optogalvanic technique could be one of the most sensitive optical methods of detecting atomic species.

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