HYPERFINE-STRUCTURE OF THE R(115) 20-1 LINE OF I-127(2) AT 570 NM

The hyperfine spectrum of the iodine R(115)20-1 line, at 570 nm, was obtained by conventional saturated absorption spectroscopy. The differences of nuclear electric-quadrupole (DELTAe Qq) and spin-rotation (DELTAC) constants between the B and X states were determined by a least-square fit to the experimental data. This line may provide a good frequency reference in coincidence with the S-1(0)-P-1(1) resonant transition of magnesium, at 285 nm, when this one is investigated with frequency doubled lasers.16215516