2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88893Quantum interference between two distinct vibrational trajectories induced by two pulse femtosecond excitation in molecules is shown to result in a photon echo, providing direct evidence of the cat state superposition of Gaussian vibrational wavepackets.3 pages, including 2 figures, contribution for the Technical Digest of the conference on Nonlinear Optics, held August 2000 in Hawaii, equation (5) correctedQuantum Physicstext