CO(A–X) electric dipole transition moment

The internuclear dependence of the CO (A 1 π– X 1 Σ+ ) transition moment has been obtained for the range 1.0<r̄<1.8 Å. This was done by making laser induced fluorescence measurements on highly vibrationally excited CO. These data were jointly fit with fluorescence lifetime data from a previous study done by Field et al. The second-order fit obtained was 〈Re(r̄)〉 =10.57(41)[1−1.177(22)r̄+0.350(13)r̄2] D. This fit provides a good description of the transition moment function in that it quantitatively fits the fluorescence branching ratio data and lifetime data and agrees with the qualitative observation of CO(A–X) transition strengths.