Photoionization quantum yields. A convenient 147 nm actinometer

The photoionization quantum yields of trimethylamine, triethylamine, dipropylamine, di−iso−propylamine, and tetramethylene sulfide have been determined, at 147 nm, to be 0.38, 0.46, 0.096, 0.15, and 0.10, respectively. These ionization efficiences permit actinometry based upon saturation current measurements. This physical technique of absolute photon flux measurement is contrasted with the chemical actinometers currently in use at 147 nm.