• Laser optogalvanic spectroscopy of argon in the wavelength region 605–740 nm

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      https://www.ias.ac.in/article/fulltext/pram/050/05/0419-0432

    • Keywords

       

      Optogalvanic spectrum; two-photon transitions; laser spectroscopy

    • Abstract

       

      Two-photon optogalvanic transitions in Ar glow discharge with Nd: YAG laser pumped dye laser excitation in the frequency range 13520–16520 cm−1 has been studied using linear and circular polarization. The intensities of two-photon optogalvanic transitions are very sensitive to changes in the incident laser power which is not the case with one-photon transitions. Intensity ratio for circular and linear polarized light for two photon transitions 6s′[1/2]°1←4s[3/2]°2, 6s′[1/2]°0←4s[3/2]°2, and 5d[1/2]°0←4s[3/2]°2, 5d[1/2]°1←4s[3/2]°2 are quite different from the other two-photon transitions. This has been explained as due to near one photon resonance of 4p′[3/2]1 level for the first pair and 4p′[1/2]1 for the second pair of transitions. The ratio of optogalvanic intensity for circular to linear polarized light has been theoretically estimated and compared with the observed results.

    • Author Affiliations

       

      R C Sharma1 T Kundu1 2 S N Thakur1

      1. Laser Spectroscopy Laboratory, Physics Department, Banaras Hindu University, Varanasi - 221 005, India
      2. Department of Physics, Indian Institute of Technology, Mumbai - 400 076, India
    • Dates

       
  • Pramana – Journal of Physics | News

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