Abstract
The refractive index of PbO tetragonal single crystals ( n ̄ 0 = 2.73±0.05 ) and parameters of thin dielectric film on their real surfaces ( n f = 1.56±0.01, d = 10−85 A ̊ ) have been measured by the method of ellipsometry at λ = 6328 A ̊ . For the first time the photo-induced changes of optical properties of PbO ( t) surface film have been observed.
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