Extinction coefficients k(\lambda) for water at 25° were
determined through a broad spectral region by manually smoothing
a point by point graph of k(\lambda) vs wavelength \lambda that
was plotted for data obtained from a review of the scientific
literature on the optical constant of water. Absorption bands
representing k(\lambda) were postulated where data were not
available in the vacuum uv and soft x-ray regions. A subtractive
Kramers-Kronig analysis of the combined postulated and smoothed
portions of the k(\lambda) spectrum provided the index of
refraction n(\lambda) for the spectral region
200 nm<=\lambda<=200 µm.
G. M. Hale, M. R. Querry, "Optical constants of water in the
200 nm to 200 µm wavelength region," Appl.
Opt.,12, 555-563 (1973).