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Absolute wave numbers with a typical uncertainty of 1 MHz (95% confidence) were measured for 102 hyperfine-structure components of 127I2. The data cover the range 560 to 656 nm with no gaps larger than 50 cm-1. The spectra were observed by use of Doppler-free frequency-modulation spectroscopy with a tunable cw laser. The laser was locked to selected iodine components, and its wave number was measured with a high-precision Fabry–Perot wavemeter. The accuracy of the results is confirmed by the good agreement of nine of the lines with previous results from other laboratories. These measurements provide a well-distributed set of precise reference lines for this spectral region.
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Craig J. Sansonetti (1997) studied this question.
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