The lifetime of the A1II state of CO has been measured by using a pulsed invertron-excitation source and a delayed-coincidence measurement technique. The fourth positive system was examined to measure this lifetime. Eighteen bands, originating from the upper states v′=0 to 5, were examined at pressures between 500 and 50 mtorr. No pressure dependence was noticed. The transition moment was found to vary and was expanded about the r centroid of the (0,0) transition. Oscillator strengths from this and other experiments are compared.
J. G. CHERVENAK and R. A. ANDERSON, "Radiative Lifetime of the A1II State of CO," J. Opt. Soc. Am. 61, 952-954 (1971)