Extinction coefficients k(lambda) for water at 25 degrees C 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 constants 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

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7) It appears from previous measurements that this orientational axis is identical with the longitudinal axis of inertia, however, we have not proved this generalization rigorously.(8) We are indebted to the referees for their comments on this matter. (9) Similar relations were derived by Norden [Chem. Script., 1, 145 (1971)] for the interpretation of the linear dichroic spectra of certain triarylmethane dyes. (10) The "in-plane" transitions are those polarized in the best plane of the molecule (which includes the twofold symmetry axis) whereasthe "out-of-plane" transitions are those polarized out of this plane.