Comment on “An interpretation of the low-frequency spectrum of liquid water” [J. Chem. Phys. 118, 452 (2003)]

The comparison between the translational densities of states of water and argon suggests that the water bands at about 60 and 240 cm−1 reflect the transverse and longitudinal dynamics, respectively. The water–argon similarity and the role of the hydrogen bonds in producing more intense and sharp bands are highlighted. Our interpretation partially contradicts that of the authors of the title article.