The ro-vibrational spectra of CO molecule resulting from the photolysis of acetone

A time-resolved Fourier-transform emission spectroscopy was used to detect the IR emission of the fragments resulting from the photolysis of acetone by 193 nm excimer laser; a double peak vibrational spectrum in the range of 1950–2250 cm−1 corresponding to the P and R branches of the CO stretching vibration. At 0.3 cm−1 resolution; the ro-vibrational lines appeared for the first three vibrational transitions. The experimental spectra match greatly the simulated one. Using the fitting methods, the populations were found for the first four vibrational levels. The vibrational spectrum and populations of the CO resulting from the photolysis of acetone in helium differ from acetone alone due to the relaxation effect of helium.