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Applied Optics

Applied Optics


  • Vol. 36, Iss. 33 — Nov. 20, 1997
  • pp: 8710–8723

Absorption spectrum (380–700 nm) of pure water. II. Integrating cavity measurements

Robin M. Pope and Edward S. Fry  »View Author Affiliations

Applied Optics, Vol. 36, Issue 33, pp. 8710-8723 (1997)

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Definitive data on the absorption spectrum of pure water from 380 to 700 nm have been obtained with an integrating cavity technique. The results are in good agreement with those recently obtained by our group with a completely independent photothermal technique. As before, we find that the absorption in the blue is significantly lower than had previously been generally believed and that the absorption minimum is at a significantly shorter wavelength, i.e., 0.0044 ± 0.0006 m−1 at 418 nm. Several spectroscopic features have been identified in the visible spectrum to our knowledge for the first time.

© 1997 Optical Society of America

Original Manuscript: March 5, 1997
Revised Manuscript: July 17, 1997
Published: November 20, 1997

Robin M. Pope and Edward S. Fry, "Absorption spectrum (380–700 nm) of pure water. II. Integrating cavity measurements," Appl. Opt. 36, 8710-8723 (1997)

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  9. Xenon Arc-Lamp Model 66005 (Oriel Corporation, Stratford, Conn.).
  10. Monochromator, Digikrom Model 240 (CVI Laser Corporation, Albuquerque, N.M.).
  11. Electromagnetic Camera Shutter (Copal Model DC495, R.T.S., Inc., Deer Park, N.Y.).
  12. High diffuse reflectance material, Spectralon SRM-99 (Labsphere, Inc., North Sutton, N.H.).
  13. See Section IX of Ref. 5.
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  15. The liquid absorption standards are identified by NBS#931d, Lot#680312, and were obtained from the NIST Office of Standard Reference Materials.
  16. A software program for the MacIntosh, profit (QuantumSoft, Cherwell Scientific, Oxford, 1996).
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  18. Note that although exactly the same raw data were used, the values quoted here are different from those in Pope’s dissertation,8 which contains a systematic error that is due to a dependence of one calibration constant on the water absorption coefficient (his Fig. V-8). The thorough analysis leading to our Eqs. (18) and (19) avoids this problem; also, we have used rigorous statistically averaging techniques to extract the maximum information from the raw data.
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