Figure 5.

A two-photon, one-field logical scheme. (It is a half-adder crossed with a field. The symbol ⊕ means addition of two Boolean variables, modulo 2. It is the Boolean variable called “sum” in Fig. 4.) This scheme uses two different aspects of molecular dynamics. As in the half-adder, Fig. 4, it takes advantage of the dynamics in the intermediate electronic state, S₁. As in the scheme of Fig. 2, it takes advantage of the more rapid quenching by the molecular core of high but not very high Rydberg states, unless these are protected by having a high m value, which is made possible by the application of the field F_m. Once m is not low, the condition ℓ ≥ m on the angular momentum of the electron keeps it away from the core and stabilizes the state so that it gives rise to a ZEKE signal. In reality, one could (see Fig. 1) include the role of two fields.