Oriented Se6 ring clusters in zeolite single crystals: Polarized Raman microscopy, optical absorption spectra and photo-induced effects

2020 ◽  
Vol 308 ◽  
pp. 110559
Author(s):  
Vladimir V. Poborchii
Keyword(s):  
Optical Absorption ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Raman Microscopy ◽  
Optical Absorption Spectra ◽  
Polarized Raman

Optical Absorption Spectra of Substituted Methylenes Oriented in Single Crystals

1966 ◽  
Vol 44 (1) ◽  
pp. 413-414 ◽  
Author(s):  
Gerhard Closs ◽  
Clyde A. Hutchison ◽  
Bryan E. Kohler
Keyword(s):  
Optical Absorption ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Optical Absorption Spectra

scholarly journals Optical Studies on KBr:Tl and KCl-Br:Tl Mixed Crystals

2010 ◽  
Vol 7 (2) ◽  
pp. 425-432
Author(s):  
P. Eswaran ◽  
A. Anbagi ◽  
S. Nagarajan
Keyword(s):  
Optical Absorption ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Emission Band ◽  
Mixed Crystals ◽  
Optical Absorption Spectra ◽  
Optical Studies ◽  
Excitation Spectra ◽  
X Ray ◽  
Wavelength Side

Optical absorption spectra of KBr:Tl+(0.0125 mol%) single crystals shows A, B and C bands around 258, 220 and 210 nm respectively. In KCl0.1Br0.9:Tl+(0.0125 mol%) mixed crystals exhibit slightly broadening of the A-band towards lower wavelength side. The broadening of the absorption spectra are suggested to be due to some complex Tl+centers involving Br-and Cl-ions formed in the mixed crystals. When excited at A, B and C-bands of Tl+ions, PL of KBr:Tl+showed emission band around 320 with a prominent shoulder around 365 nm. In KCl0.1Br0.9mixed crystals the shoulder around 365 nm is not prominent due to the perturbing influence of Cl-ions. Addition bands in the excitation spectra are attributed to the presence of Tl+dimmers. PSL observed in X-ray irradiated crystals resembled their respective PL emissions indicating that PSL in them is due to Tl+ions.

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