The relation between laser pulses serving the purpose of controlling elementary molecular processes and the instantaneous dynamics of the perturbed system is investigated. The application of the conditions assuring a controlled change of the expectation value of an observable directly links the internal motion to the external perturbation. Several numerical applications document that the derived control fields are efficient and can be interpreted clearly on physical grounds.
doi:10.1063/1.1891728
View online : J. Chem. Phys. (accepté 2005).