title: Comment on "Pushing the hyperpolarizability to the limit".
abstract: It is shown that energy/length scaling complicates maximizing the first hyperpolarizability of a single electron as a function of the potential. A more transparent formula for this hyperpolarizability is given. Examining this formula demonstrates that Zhou et al.(1) have not proved that modulated conjugation results in large hyperpolarizability.
authors: Department of Physics, Case Western Reserve University, Cleveland, Ohio 44120-7900, USA.
authors: Greg A
authors: GA
authors: Wiggers
authors: Rolfe G
authors: RG
authors: Petschek