Hyperfine structure of the rovibronic transitions R(0)–R(10) and P(1)–P(5) in the 13–1 band belonging to the B–X system of <sup>127</sup>I<sub>2</sub> was studied by rectangular-crossing molecular-beam laser spectroscopy. The full width at halfmaximum of the observed lines was 5 MHz, which corresponds to a resolving power of 10<sup>8</sup>. Not only allowed transitions δF = δJ but forbidden transitions δF = 0 and δF =−δJ were identified, and absolute hyperfine coupling constants of the rovibronic states (J = 0−10) in the B(v′ = 13)–X(v″ = 1) transition were determined. In addition, the relative line strength of each hyperfine transition was compared with the theoretical value.
© 1988 Optical Society of America
M. Wakasugi, T. Horiguchi, M. Koizumi, and Y. Yoshizawa, "Hyperfine structure near the 13—1 band head in the B—X transition of 127I2," J. Opt. Soc. Am. B 5, 2298-2304 (1988)