High precision measurements of hyperfine structures near 790 nm of I-2

High precision measurements of hyperfine splittings of rovibrational lines of the (upsilon' - upsilon ') = (0-15) band of the BOu+ - XO(g)(+) transition of I-2 were performed in the near infrared around 790 nm using spectrally narrowed diode lasers. Rotational states with J '' between 0 and 99 were investigated and hyperfine parameters could be derived for the two electronic states separately. For the first time the rotational variation of the quadrupole and the spin-rotational hyperfine coupling parameters could be determined for I-2. A relation is given, by which the hyperfine parameters for a rotational line of the (0-15) band can be predicted, and by which hyperfine splittings of this band can be calculated with an uncertainty of less than 100 kHz for 16 less than or equal to J '' less than or equal to 99.