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Contrast ratio and separation factor in multiphoton dissociation of supercooled UF6 irradiated with multifrequency 16 μm Raman-laser radiation

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Abstract

In infrared multiphoton dissociation of supercooled UF6 irradiated with multifrequency para-H2 Raman laser beams, separation factors and contrast ratios were measured by selective multiphoton ionization of the photoproduct UF5 at 532 nm followed by time-of-flight mass spectrometric analysis. The relationship between separation factor and contrast ratio is discussed theoretically and quantitatively investigated in the experiments. From this relationship, we obtain the irradiation conditions of the laser-beam fluences for attaining a high separation factor and estimate the value of the intrinsic separation factor in multifrequency dissociation of UF6.

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Abbreviations

C r (235):

contrast ratio with respect to235UF6

q s5 :

yield of isotopically selective dissociation with respect to235UF6

q s8 :

yield of isotopically selective dissociation with respect to238UF6

q n5 :

yield of isotopically non-selective dissociation with respect to235UF6

q n8 :

yield of isotopically non-selective dissociation with respect to238UF6

S :

separation factor

S 0 :

intrinsic separation factor

Φ i :

fluence of individual beamΩ i [J/cm2]

Ω 1 :

Raman-laser beam for exciting235UF6 molecules selectively

Ω 2 :

Raman-laser beam for pumping UF6 molecules excited byΩ 1

Ω 3 :

Raman-laser beam for pumping excited UF6 molecules further to a dissociative state

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Author notes

  1. S. Kato

    Present address: Toyota Physical & Chemical Research Institute, Yokomichi 41-1, 480-11, Nagakute, Nagakute-cho, Aichi-gun, Aichi, Japan

Authors and Affiliations

  1. The Institute of Physical and Chemical Research (RIKEN), Hirosawa 2-1, 351-01, Wako, Saitama, Japan

    Y. Okada, S. Kato, K. Sunouchi, S. Satooka, H. Tashiro & K. Takeuchi

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  1. Y. Okada
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  2. S. Kato
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  3. K. Sunouchi
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  4. S. Satooka
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  5. H. Tashiro
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  6. K. Takeuchi
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Okada, Y., Kato, S., Sunouchi, K. et al. Contrast ratio and separation factor in multiphoton dissociation of supercooled UF6 irradiated with multifrequency 16 μm Raman-laser radiation. Appl. Phys. B 62, 77–81 (1996). https://doi.org/10.1007/BF01081251

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  • DOI: https://doi.org/10.1007/BF01081251

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