Oscillator strengths for the Schumann-Runge bands of 16O18O

Abstract

Oscillator strenghts were measured for the (2-0)-(15-0) Schumann-Runge bands of 16O18O. Individual rotational lines were studied at a resolution of ≈0.05Å. Band oscillator strenghts decrease with increasing rotation at a rate intermediate between those for 16O2 and 18O2. Our measurements are in good agreement with oscillator strenghts calculated using potential curves and dipole moments derived from 16O2 measurements, and support conclusions that 16O18O plays only a minor role in the photodissociation of atmospheric O2. Dipole moments deduced from our oscillator strenghts agree well with those obtained for 16O2, 18O2, as well as with recent ab initio and semi-empirical determinations. Show more