The [formula omitted] band of 16O 17O, 17O 18O and 17O 2 by high sensitivity CRDS near 1.27 μm

Abstract

The very weak a 1 Δ g − X 3 Σ g − system of the three 17O isotopologues of oxygen – 16O 17O, 17O 18O and 17O 2 – was studied by high sensitivity CW-Cavity Ring Down Spectroscopy. The spectra of a 17O highly enriched sample were recorded at room temperature between 7640 and 7917 cm −1 and at liquid nitrogen temperature in the 7876–7893 cm −1 region. The magnetic dipole (0–0) band was observed for all three 17O isotopologues. At liquid nitrogen temperature, some of the transitions were observed with partially resolved hyperfine splitting due to the 17O nuclear spin. The electric quadrupole (0–0) band and the (1–1) hot band were also observed for the 16O 17O and 17O 2 species. The rotational and hyperfine spectroscopic parameters of the X 3 Σ g − and a 1Δ g states of the three studied isotopologues were derived from a global fit of the measured line positions and microwave and Raman measurements available in the literature. The spectroscopic constants of the a 1Δ g ( v=0, 1) states of 17O 2 are reported for the first time.