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

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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.

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Authors and Affiliations

  1. Laser Spectroscopy Laboratory, Physics Department, Banaras Hindu University, 221 005, Varanasi, India

    R C Sharma, T Kundu & S N Thakur

  2. Department of Physics, Indian Institute of Technology, 400 076, Mumbai, India

    T Kundu

Authors
  1. R C Sharma
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  2. T Kundu
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  3. S N Thakur
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Sharma, R.C., Kundu, T. & Thakur, S.N. Laser optogalvanic spectroscopy of argon in the wavelength region 605–740 nm. Pramana - J Phys 50, 419–432 (1998). https://doi.org/10.1007/BF02847371

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  • DOI: https://doi.org/10.1007/BF02847371

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