Hyperfine structure of the a1Δg-X3∑g- transitions of 16O17O, 17O18O and 17O2 by CRDS at 80 K

► The CRDS spectrum of the a1Δg-X3∑g- band of 16O17O, 17O18O and 17O2 has been recorded at 80 K. ► The nuclear hyperfine structure of the transitions could be partly resolved. ► The hyperfine parameter coupling in the a1Δg state has been derived.