Optical Spectra of Gamma-Irradiated LiF Crystals with Anisotropic Lithium Nanoparticles
Journal Article
·
· Optics and Spectroscopy
- Academy of Sciences of Uzbekistan, Institute of Nuclear Physics (Uzbekistan)
The optical response of Li anisotropic defects and nanoparticles from three faces of cubic LiF crystals with 10-mm edges to γ radiation from a {sup 60}Со source with doses of 10{sup 5}–10{sup 9} R at 320 K in air is studied. After a maximum dose of 10{sup 9} R, scanning electron microscopy revealed submicron metal lithium flakes ordered into long parallel nanofilaments. The resonance absorption band, which shifts from 272 to 295 nm with increasing dose, is assigned to lithium nanocolloids in the (110) plane. The band at 202–225 nm observed only from the (100) face narrows at doses below 10{sup 5} R and is assigned to diatomic fluorine molecules in interstitial sites. The appearance of the 209–212–215-nm triplets at 2.7 × 10{sup 5} R from the (100) plane and the 211–213–215-nm triplets at 0.9 × 10{sup 5} R from the (010) plane is related to radiation-induced axially symmetric bipolarons with a high oscillator strength. The splitting of the 445-nm band into a 438–445–450-nm triplet is observed only for the (010) plane after a dose of 10{sup 6} R and is related to surface plasmon polaritons (longitudinal and transverse) of elongated Li nanoparticles. The (F{sub 2}–F{sub 3}) complexes are oriented in the most imperfect (111) plane and are seen along three cubic axes.
- OSTI ID:
- 22786458
- Journal Information:
- Optics and Spectroscopy, Journal Name: Optics and Spectroscopy Journal Issue: 5 Vol. 124; ISSN 0030-400X; ISSN OPSUA3
- Country of Publication:
- United States
- Language:
- English
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