کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1482347 | 991563 | 2012 | 6 صفحه PDF | دانلود رایگان |
Rhodamine B (RhB) is polycrystalline in powder form; it becomes nanocrystalline in thermally evaporated films. Gamma-rays induce nanocrystalline to amorphous transformation of RhB films. The optical constants are independent of film thickness. The type of electronic transition for as-deposited and gamma-ray irradiated RhB film is indirect allowed one. The onset and optical energy gap for as-deposited films are 2 and 3.45 eV, respectively. Exposure to different γ-ray doses did not change the transmittance and reflectance behavior of RhB films. γ-ray irradiation decreases onset and optical energy gap, refractive index and dispersion parameters and increase extinction coefficient, oscillator and electric dipole strengths.
► Rhodamine B (RhB) is polycrystalline in powder form.
► It transforms to nanocrystallites phase upon thermal deposition.
► Gamma ray induces transformation of nanocrystallites RhB to amorphous structure.
► The optical constants are independent off film thickness.
► Gamma ray influences optical properties of RhB films.
Journal: Journal of Non-Crystalline Solids - Volume 358, Issue 5, 1 March 2012, Pages 915–920