Fluorescence Quantum Yield of HCO upon photolysis of H₂CO by simultaneous LIF and DFWM spectroscopy in a molecular beam apparatus

A Gaussian fit procedure is applied on the DFWM and LIF spectra to yield the two traces labeled FIT (DFWM) and FIT (LIF). The relative quantum yield of the probed ^qR₀(0) fragment transition (NO=0, K_aO=0) is obtained by dividing the LIF areas by the square root of the DFWM areas. The result is convoluted by a Lorentzian profile to obtain relative fluorescence quantum yields.