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Highly selective and efficient multiphoton dissociation of polyatomic molecules in multiple-frequency IR-laser fields

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Abstract

An ir multiphoton dissociation (MPD) process in multiple-frequency ir-laser fields has been experimentally realized. A selectivity ofS=104 was obtained in separating13C/12C isotopes upon multiple-frequency ir multiphoton dissociation (MFMPD) of the CF2HCl molecule, the dissociation yield13β for the13CF2HCl molecule amounting to around 1%. A yield of13β was reached at a selectivity ofS=102, and the total laser fluence required for the process was reduced. A new mechanism—“sticking” of molecules on the lower discrete vibrational levels—responsible for the low MPD yields observed for some molecules is discussed and a technique to eliminate it and thus maximize the dissociation yields is proposed. Ways to improve the selectivity by MFMPD are analyzed and a simple method for obtaining from a single TEA CO2 laser a multiple-frequency radiation suitable for experimental realization of MFMPD is suggested.

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Authors and Affiliations

  1. Institute of Spectroscopy, USSR Academy of Sciences, SU-142092, Troitsk, Moscow Region, USSR

    A. V. Evseev, V. S. Letokhov & A. A. Puretzky

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  1. A. V. Evseev
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  2. V. S. Letokhov
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  3. A. A. Puretzky
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Evseev, A.V., Letokhov, V.S. & Puretzky, A.A. Highly selective and efficient multiphoton dissociation of polyatomic molecules in multiple-frequency IR-laser fields. Appl. Phys. B 36, 93–103 (1985). https://doi.org/10.1007/BF00694695

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