Etude de l'absorption optique du vanadium en couches minces interpretation par la theorie des bandes d'energie

Optical absorption of vanadium thin films has been determinated from 0.32 to 5.5 eV from reflectance and transmittance data. The films have been deposited in ultra high vacuum and the measurements have been realised in situ. Between 1 to 5.5 eV, we note a large absorption band which is independant of the photons angle of incidence and polarisation; with an important maximum and a shoulder respectively at 3.1 and 2 eV. We explain this absorption band by direct interband transitions deduced from theorical bands calculated by Yasui et al. From 0.32 to 1 eV, the observed absorption is principally due to intraband transitions.