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Liouville pathways for two coupled oscillators for the echo signal emitted in the −k1+k2+k3 direction. Horizontal dashed lines imply a spontaneous coherence or population transfer in the corresponding time period. The diagrams are arranged according to their detection frequency on the ωt. axis. (A) ωt = ω1; (B) ωt = ω1 - δ; (C) ωt = ω2; (D) ωt = ω2 - δ; (E) ωt = ω1-Δ; and (F) ωt = ω2-Δ; where Δ is the diagonal and δ the mixed mode anharmonicity.
