Photodissociative channels at 1216 Å for H2O, NH3, and CH4

H(2S) and O(1D, 3P) yields have been measured from photolysis of H2O, NH3, and CH4 at 1216 Å. From H2O, it is confirmed that the H2+O(1D) channel occurs with a yield of 0.1, but in addition there is a yield of 0.12 for the channel giving 2H(2S)+O(3P). The remaining process is H+OH production. For NH3, the NH+2H(2S) channel accounts for at least 90% of the dissociation. For CH4, combination of our data with earlier work on H2 and CH production at 1236 Å leads to the conclusion that the two major dissociative channels generate 1CH2+H2 and CH2+2H(2S), with comparable probabilities. CH and CH3 production is at most minor. The yields at 1216 Å for the three-fragment processes O+2H, NH+2H, and CH2+2H, exhibit a dependence on the available excess energy.