COHERENT INTERACTION OF AN ULTRASHORT ZERO-AREA LASER-PULSE WITH A MORSE OSCILLATOR

Dissociation probabilities, energy absorption, and ground-state populations are calculated numerically for interaction of a Morse oscillator with a resonant ultrashort (tp<10-12 sec) intense laser pulse as a function of intensity and pulse area in order to investigate the sensitivity of coherence phenomena to delocalization and chaos in molecule-radiation field systems. It is concluded that a zero-area pulse can reduce considerably energy absorbed by a molecule as well as dissociation probabilities for intensities below and near the chaotic region. It is found that the two-level model (describing the interaction of light resonant with the ground to first excited level transition) works well up to the intensity 1012 W/cm2, above which transitions to higher levels must be considered. © 1990 The American Physical Society.