Arc-evaporated carbon films: Optical properties and electron mean free paths

Journal Article · Sat Jun 15 00:00:00 EDT 1985 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.31.8097· OSTI ID:5788328

Arakawa, E T; Dolfini, S M; Ashley, J C; Williams, M W

The real and imaginary parts of the complex refractive index, n(..omega..) = n(..omega..)+ik(..omega..), of arc-evaporated carbon films have been obtained over the range of photon energies h..omega.. from 0.5 to 62.0 eV. Values of k(..omega..) obtained from transmission measurements in this energy range were combined with values of k(..omega..) from the literature in the infrared and soft-x-ray regions. A Kramers-Kronig analysis then yielded the values of n(..omega..). The density of the arc-evaporated carbon films was found to be 1.90 +- 0.05 g cm/sup -3/ by the ''sink-float'' method, and their thicknesses were determined optically. A sum-rule calculation yielded the effective numbers of valence and core electrons to be 4.2 and 1.8, respectively. The experimental values determined for n(..omega..) have been used to estimate values of the inelastic mean free path ..lambda..(E) for electrons of energy E from 200 to 3000 eV in amorphous carbon. Good agreement is found between ..lambda..(E) and experimentally determined values of electron attenuation length L(E) from the literature.

• Research Organization: Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• OSTI ID: 5788328
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 31:12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON
CHARGED-PARTICLE TRANSPORT
REFRACTIVITY
ELECTRONS
TRANSMISSION
KRAMERS-KRONIG CORRELATION
MEAN FREE PATH
THIN FILMS
VAPOR DEPOSITED COATINGS
COATINGS
CORRELATIONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FILMS
LEPTONS
NONMETALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATION TRANSPORT
360603* - Materials- Properties