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First-stage enrichment in CO2-laser-induced13C separation by a two-stage IRMPD process: IRMPD of CHClF2/Br2 mixtures

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Abstract

We have been studying the practical CO2-laser-induced13C separation by a two-stage IRMPD process. The IRMPD of natural CHClF2 in the presence of Br2 mainly produced CBr2F2, which was found to be highly enriched with13C. The yield and13C-atom fraction of CBr2F2 were examined as functions of pulse number, laser line, laser fluence, total pressure, and Br2 pressure using a CO2 TEA laser with an output less than 1 J pulse−1 in order to optimize experimental conditions for13C separation. For example, we obtained CBr2F2 at a13C concentration of 55% in the irradiation of the mixture of 100-Torr CHClF2 and 10-Torr Br2 with the laser radiation at a wavenumber of 1045.02 cm−1 and at a fluence of 3.4 J cm−2. The mechanism for the IRMPD is discussed on the basis of observed results. Using 8-J pulses, we were able to obtain 1.9×10−4 g of13C-enriched CBr2F2 (13C-atom fraction, 47%) per pulse under selected conditions. It is possible to produce 90% or higher13C by the second-stage IRMPD of the CBr2F2 in the presence of oxygen.

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Author notes

  1. P. Ma

    Present address: Quinghai Institute of Saline Lake, Academia Sinica, Xining, People's Republic of China

Authors and Affiliations

  1. Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606, Kyoto, Japan

    S. Arai

  2. The Institute of Physical and Chemical Research, 351-01, Wako-shi, Saitama, Japan

    K. Sugita, P. Ma, Y. Ishikawa, H. Kaetsu & S. Isomura

Authors
  1. S. Arai
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  2. K. Sugita
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  3. P. Ma
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  4. Y. Ishikawa
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  5. H. Kaetsu
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  6. S. Isomura
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Arai, S., Sugita, K., Ma, P. et al. First-stage enrichment in CO2-laser-induced13C separation by a two-stage IRMPD process: IRMPD of CHClF2/Br2 mixtures. Appl. Phys. B 48, 427–435 (1989). https://doi.org/10.1007/BF00694544

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  • DOI: https://doi.org/10.1007/BF00694544

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