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Refractive index of carbon
wavelength 200 nm to 625 nm: Schnaiter M et al 1998 (real part only, effect of particle shape, clusters of 5-15 nm carbon grains)
wavelength 300 nm to 900 nm: Marley NA et al 2001
wavelength 350 nm to 1000 nm (average value in that range): Janzen J 1979 (see also a review of experimental data therein)
wavelength ~550 nm: Bond TC and Bergstrom 2006
Bond TC and Bergstrom 2006 review results of measurements of the complex refractive index of carbonaceous particles in a part of their review of light absorption by these particles. Based on their Table 4, the following ranges of the real and imaginary parts of the refractive index in the vicinity of the wavelength of 550 nm, can be given:
Bond TC and Bergstrom 2006 hypothesized that some variations in the refractive indices of carbonaceous materials measured by various researchers result from the presence of voids in the particle material and show that a significant portion of these variations can be explained by by this hypothesis. They do this by using the Bruggeman approximation (for example, Chýlek P et al 1988) for an effective refractive index of composite material: air, n = 1.0 - 0i plus "voidless" carbon, n = 1.95 - 0.79i. Other variations in the refractive index of carbonaceus matter, particularly for coal, could be caused by differences in graphitization.
wavelength 400 nm to 800 nm and 2.5 μm to 10 μm (interpolated between 800 nm and 2.5 μm): Dalzell WH and Sarofim 1969
wavelength 450 nm, 550 nm, 655 nm, 820 nm: Egan WG 1982
Jonasz M. 2010. Refractive index of carbon (www.mjcopticaltech.com/Publications/RefIndOfCarbon.php).
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