Separation of barium isotopes by selective two-step photoionization process.

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Separation of barium isotopes with a selective two-step photoionization process was accomplished using a continuous wave dye laser and ultra-high pressure mercury lamp. Narrow linewidth laser light was tuned to the 6s2 1S0-6s6p 1P1, resonance line (553.6 nm), and only a single isotopic component in an atomic beam was excited through the isotope shift. The excited atoms were successively ionized by uv radiation and deflected by a static electric field. <BR>The spectrum of the ion current separated isotopically agreed well with spectroscopic data within the system resolution of 65 MHz. The isotopic enrichment of 138Ba was 97%, which corresponded to the selectivity of 1.36. The ionization rate defined as what portion of the incident atoms was ionized was approximately 4×10-5%. The photoionization cross section was estimated from the experimental results by using the least squares method. The resultant value was (4±1)×10-23m2.
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