Few-states models for three-photon absorption.

  title={Few-states models for three-photon absorption.},
  author={Peter Cronstrand and Patrick Norman and Yi Luo and Hans {\AA}gren},
  journal={The Journal of chemical physics},
  volume={121 5},
Few-states models are derived for the calculation of three-photon absorption matrix elements. Together with earlier derived few-states models for two-photon absorption, the models are evaluated against results from response theory calculations that provide the full sum-over-states values. It is demonstrated that not even for systems with charge-transfer character, where few-states models for two-photon absorption are in excellent agreement with response theory, do the models provide a… CONTINUE READING