Intermodulated fluorescence spectroscopy of BO2 using a stabilized dye laser

Abstract

The hyper fine structure of 37 R‐branch transitions involving several vibrionic bands in the ground (? ²Π_g) and excited (? ²Π_u) electronic states of ¹¹BO₂ has been observed by the technique of saturation spectroscopy with intermodulated fluorescence detection. Stabilization of the cw dye laser together with the elimination of spectral power broadening has permitted the achievement of linewidths of better than 10 MHz for a single hyperfine component. A set of plausible hyperfine constants for both electronic states determined from the observed splittings is also reported.