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A spectroscopic study of the 33P (6-3) line in the B-X system of 127 I 2 iodine molecule at 633 nm was undertaken using a continuous-wave tunable dye laser. The uncertainty in the frequency interval measurements between the hyperfine components, of a few kilohertz, allows determination of the differences between the constants of the four principal hyperfine interactions.
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Razet et al. (1993) studied this question.
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