Linear response in the strong field domain.

  title={Linear response in the strong field domain.},
  author={Alex C Han and Moshe Shapiro},
  journal={Physical review letters},
  volume={108 18},
We show that, while it is well-known that first-order perturbation theory leads to linear response (of, e.g., a material system to an external field), the reverse is not true: linear response does not necessarily imply the validity of first-order perturbation theory, nor does it follow from it that the external perturbation is weak. We do so by analyzing the intensity dependence in the photoexcitation followed by dissociation or isomerization of a bound molecular system by a shaped broadband… CONTINUE READING