Abstract
The full hyperfine components of the R (127) line in the 11-5 band and the 10 components of the P (33) line in the 6-3 band of the B←X electronic transition of 127I2 were observed by the saturated absorption spectroscopy using a complex resonator He-Ne laser. The frequency of the laser was locked to each component and the frequency separations of the components were precisely measured. The hyperfine structure of the R (127) line was compared with a model which included both a nuclear electric quadrupole and magnetic hyperfine interactions.
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