1972 Volume 33 Issue 5 Pages 1407-1414
The reflectivity spectra of NaNO3 single crystal have been measured in the region from 4 to 12 eV with polarized light normally incident upon the cleaved surface (10\bar11). Two principal dielectric constants, \hatεo and \hatεe, have been derived from the spectra with the application of the Kramers-Kronig relation and the equation of dielectric ellipsoid for uniaxial crystals. The profile of the absorption spectrum derived from the reflectivity is in good agreement with the absorption spectrum of thin films, particularly with respect to the bands at about 6 eV and 10.5 eV. It is found that the 6 eV band is active to light polarized perpendicularly to the c axis and the oscillator strength of the band is 0.49 per NO3− molecule. These facts support the previous assignment that the absorption is due to π2→π* (A1′→E′) in NO3−. The 10.5 eV band is found to be active to light polarized perpendicularly to the c axis, and is assigned to the electron transfer from the n2(e′) orbitals of NO3− to the Na+–3s orbital.
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