Comments on the paper “Coherent four-photon spectroscopy of low-frequency molecular librations in a liquid” by A F Bunkin, A A Nurmatov, and S M Pershin
Federal Research Center Institute of Applied Physics of the Russian Academy of Sciences, ul. Ulyanova 46, Nizhny Novgorod, 603000, Russian Federation
The results outlined in the paper published in the journal Uspekhi Fizicheskikh Nauk (see Usp. Fiz. Nauk 176 (8) 883 (2006) [Phys. Usp. 49 (8) 855 (2006)]) are analyzed. The interpretation of all the spectra presented is shown to be unsatisfactory, thus compromising the conclusions of the paper.