Measurements of the magnitude and spectral distribution of the Raman-scattering coefficients of pure water (b_rw) and seawater (b_rs) are presented. Two independent measurements of the spectral distribution of the Raman-scattering coefficient of pure water were made for incident wavelengths ranging from 250 to 500 nm. These measurements revealed a strong dependence of b_rw on wavelength that could be represented by a (λ′)^−5.3∓0.3 relationship, where λ′ is the incident wavelength, or a λ^−4.6∓0.3 relationship, where λ is the Raman-scattered wavelength, when normalized to units of photons. The corresponding relationships for normalization to energy are (λ′)^−5.5∓0.4 and λ^−4.8∓0.3, respectively. These relationships are found to be consistent with resonance Raman theory for an absorption wavelength of 130 nm. The absolute value ofb_rw for the 3400-cm⁻¹ line was found to be (2.7 ∓ 0.2) × 10⁻⁴ m⁻¹ for an incident wavelength of 488 nm, which is consistent with a number of earlier reports. The difference between the magnitudes of the Raman-scattering coefficients for pure water and seawater was statistically insignificant.

© 1998 Optical Society of America

[Optical Society of America ]

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