Spin-orbit and rotation-electronic perturbations among the D1Δ(υ=8), A1Π(υ=6), d3Δ(υ=12), and a′3Σ+-(υ=17) levels have been observed in the two-photon laser excitation spectrum of the D1Δ-X1Σ+ (8-0) band of CO. To aid in the assignment of spectral lines, both prompt and delayed spectra were recorded, by gating the vacuum ultraviolet fluorescence. Spectra have been analyzed using a weighted nonlinear least-squares fitting method. Detailed assignments and wavenumbers are presented for the D-X (8-0), A-X (6-0), d-X (12-0), and a′-X (17-0) bands, as well as mixing coefficients for the D, A, and d states. Molecular constants and perturbation parameters have also been determined. Fluorescence lifetimes were obtained for some perturbed levels, and the effect of mixing on radiative and collisional decay is discussed.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry