Czechoslovak Journal of Physics

, Volume 56, Supplement 2, pp B749–B760 | Cite as

Near infrared second overtone cw-cavity ringdown spectroscopy of H2D+ ions

  • P. Hlavenka
  • I. Korolov
  • R. Plašil
  • J. Varju
  • T. Kotrík
  • J. Glosík


A study of H2D+ ions in their lowest rotational states is presented. The ions are generated in pulsed discharge in liquid N2 cooled He/Ar/H2/D2 gas mixture. Near infrared (NIR) second overtone transitions in the 6459–6467 and 6490–6492 cm−1 (1.540, 1.548 µm) region are used to identify the ions and determine their degree of rotational excitation. The data were obtained using NIR Cavity Ringdown Absorption Spectroscopy (NIR-CRDS). The sensitivity obtained was typically 5 × 10−9 cm−1. The measured second overtone transition frequencies are in good agreement with ab initio predictions with systematic shift −0:1 cm−1. The kinetics and rotational temperatures during discharge period was determined. The absolute number density of H2D+ as a function of H2/D2 mixing ratio is measured and results are compared to previous measurement of D2H+ ion.

Key words

H2D+ CRDS overtone spectroscopy plasma 


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Copyright information

© Institute of Physics, Academy of Sciences of Czech Republic 2006

Authors and Affiliations

  • P. Hlavenka
    • 1
  • I. Korolov
    • 1
  • R. Plašil
    • 1
  • J. Varju
    • 1
  • T. Kotrík
    • 1
  • J. Glosík
    • 1
  1. 1.Faculty of Mathematics and Physics, Department of Electronics and Vacuum PhysicsCharles UniversityPrague 8Czech Republic

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