QUANTUM DYNAMICS OF A DIATOMIC MOLECULE UNDER CHIRPED LASER-PULSES

The photodissociation probability of a diatomic molecule is usually ve ry small even under a strong field due to its anharmonicity. However, the progress in laser technology provides a chirped laser pulse to low er the threshold of the dissociation intensity. We investigate the qua ntum dynamics of a diatomic molecule under such a kind of pulse. It is found that there is a significant dissociation probability at moderat e intensity for a diatomic molecule under a chirped pulse. The quantum dissociation probability is found to be suppressed with respect to th e classical one for intensities above the dissociation threshold. Ther efore the chirped pulse can efficiently dissociate a diatomic molecule .