DETERMINATION OF THE HYPERFINE-STRUCTURE IN THE ALPHA-2-SIGMA-1/2+ STATE OF OH BY FREQUENCY-DOUBLED DYE-LASER RADIATION

The hyperfine structure of OH in the 122+ state has been measured by exciting a molecular beam with cw intracavity frequency-doubled dye-laser radiation. The splittings are 778 MHz for N′=0 and 200to 500 MHz for 1< N′<5. The values for the hyperfine and ρ doubling are b+13c=777.8±2.0 MHz, c=165.8±2.8 MHz, and γ=7.13±0.03 GHz. Also the hyperfine splitting of OD in the N′=0 state has been measured yielding b+13c=119±2 MHz. © 1979 The American Physical Society.