COMMENT ON THE INVERSION OF RAMAN EXCITATION PROFILES - REPLY

The Raman amplitude when extended into the complex energy plane can ha ve zeros in the right-half plane. Minimum phase approaches to invert t he Raman excitation profile (REP) to recover the Raman amplitude are v alid only for the case where the Raman amplitude does not admit zeros in the right-half plane. A minimum phase algorithm applied to a REP gi ves a unique amplitude, but this amplitude and its corresponding cross -correlation function are wrong if the REP corresponds to a nonminimum phase problem. The minimum phase treatment therefore does not carry a ll possible physical information for a nonminimum phase REP.