Extinction coefficients k (λ) for water at 25°C were determined through a broad spectral region by manually smoothing a point by point graph of k (λ) vs wavelength λ that was plotted for data obtained from a review of the scientific literature on the optical constants of water. Absorption bands representing k (λ) 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 (λ) spectrum provided the index of refraction n (λ) for the spectral region 200 nm ≤ λ ≤ 200 µm.
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