... medium1
Crystalline graphite has a strong resonant feature near  11.52 (Draine, [1984]) which is not observed.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... width2
Note that the observed weakness of the bump strength in dense clouds can be attributed to the hydrogenation of carbon (Sorrell, [1990]).
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... Gold-type3
Its idea was first suggested by Gold ([1952]).
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

...fpell)4
A similar conclusion follows from calculations made by Matsumura and Seki ([1996]).
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.

... correct''5
Correctness'' is contained in the use of the measured optical constants for which real and imaginary parts are already connected by Kramers-Kronig relations but not a wavelength-independent refractive index.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.