Optical Absorption Spectra and Dynamic Jahn-Teller Effect of V2+ Ions in ZnSe

2008 ◽  
Vol 63 (12) ◽  
pp. 830-838
Author(s):  
Yi-Yang Zhou
Keyword(s):  
Optical Absorption ◽  
Crystal Field ◽  
Absorption Spectra ◽  
Optical Absorption Spectra ◽  
Cubic Crystal ◽  
Racah Parameter ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Tetrahedral Crystal ◽  
Good Agreement

The Hamiltonian matrices for 3d3 ions in a cubic crystal field are introduced, based on a molecular orbital model, including the electronic Coulomb and tetrahedral crystal-field interactions and the spin-orbit coupling. The optical absorption spectra of V2+ ions in ZnSe are studied. Moreover, the various additional levels found close to 5680 cm−1 are considered. These levels are assumed to result from the dynamic Jahn-Teller splitting within the excitation levels 2T2 and 2T1 in ZnSe:V2+. The good agreement between the present results and the experimental observations indicates that the contribution of the covalence reduction factors NE and NT2 and of the Racah parameter A to the optical absorption spectra of V2+ ions in ZnSe is important. However, most of the previous theoretical studies of these spectra in ZnSe:V2+ have neglected the Racah parameter A, based on the classical crystalfield model. A significant charge-transfer effect found in recent works is confirmed in ZnSe:V2+.

Optical Absorption Spectra of the A Band in KBr:Pb2+ Crystals

1975 ◽  
Vol 53 (2) ◽  
pp. 200-201 ◽  
Author(s):  
Taiju Tsuboi ◽  
Robert E. Chaney ◽  
P. W. M. Jacobs
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
High Temperatures ◽  
Line Shape ◽  
Low Temperatures ◽  
Alkali Halides ◽  
Teller Effect ◽  
Optical Absorption Spectra ◽  
Jahn Teller ◽  
Jahn Teller Effect

The shape of the A band in KBr:Pb2+ has been studied at various temperatures between 13 and 296 K. The band is almost symmetric at low temperatures but slightly asymmetric at high temperatures. The observed line shape of the A band in KBr:Pb2+ is discussed in terms of the Jahn–Teller effect and is compared with that of the A band in In+ and Tl+ doped alkali halides.

Jahn-Teller Effect on Optical Absorption Spectra of MnO

1978 ◽  
Vol 44 (4) ◽  
pp. 1168-1176 ◽  
Author(s):  
Yōichi Takaoka ◽  
Naoshi Suzuki ◽  
Kazuko Motizuki
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Teller Effect ◽  
Optical Absorption Spectra ◽  
Jahn Teller ◽  
Jahn Teller Effect

Optical Absorption Spectra of Crystal‐Field Transitions in MnO

1969 ◽  
Vol 50 (9) ◽  
pp. 4092-4094 ◽  
Author(s):  
Donald R. Huffman ◽  
R. L. Wild ◽  
M. Shinmei
Keyword(s):  
Optical Absorption ◽  
Crystal Field ◽  
Absorption Spectra ◽  
Optical Absorption Spectra

ESR and Optical Absorption Spectra of Copper (II) Ions in Glasses

2008 ◽  
Vol 55-57 ◽  
pp. 849-852 ◽  
Author(s):  
Jakrapong Kaewkhao ◽  
S. Rhianphumikarakit ◽  
N. Udomkan
Keyword(s):  
Absorption Band ◽  
Optical Absorption ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Light Blue ◽  
Jahn Teller ◽  
Doped Glasses ◽  
Jahn Teller Effect ◽  
G Value ◽  
Cu Ions

Glasses in the system 20Na2O-Al2O3-13B2O3-6.3CaO-0.2Sb2O3-1.5PbO2-(58-x)SiO2-xCuO were prepared with x = 0.0, 0.2, 0.4, 0.6 and 0.8 mol% respectively. ESR absorption spectra due to Cu2+ (3d9) ions show that the ESR signal at 0.2 and 0.4 mol%CuO were similarity, the perpendicular g-value,g^ can be observed at 2.06 whereas the parallel g-value,g// cannot be observed. The line width of board line centers were depends on the increasing of concentration of CuO-doped. CuO-doped glasses give rise light blue green color. Confirm from optical absorption techniques as UV-VIS measurment reported were recorded at room temperature. The absorption band near 800 nm (2B1g®2B2g) is due to Jahn-Teller effect of Cu2+. Also absorption band at around 400 nm (2B1g®2Eg) could be found due to d-d transition of Cu2+ ion in the CuO doped glasses. The results obtained suggest that Cu ions substitutes as an accepted center for [SiO2]4+ in oxygen octahedral rhombohedral distortion.

Impact of Cr3+ substitution on the nephelauxetic ratio and Racah parameter of Cr-Mn-Zn nanoferrites

2021 ◽  
Author(s):  
M. Abdo ◽  
M.S. Sadeq
Keyword(s):  
Optical Absorption ◽  
Absorption Spectra ◽  
Tunable Laser ◽  
Ligand Field ◽  
Optical Absorption Spectra ◽  
B Values ◽  
Racah Parameter ◽  
Low Field ◽  
Optical Applications ◽  
First Time

Abstract For the first time, we present the ligand field splitting (10Dq) nephelauxetic ratio (β), Racah parameter (B) and stability of Cr3+ within Mn–Zn nanoferrite which synthesized using the citrate route. These parameters were determined via optical absorption spectra. The obtained bands in the significance range of optical absorption spectra are wide as well as asymmetric; therefore the deconvolution process becomes a necessary task. The values of 10Dq and B have been estimated from the produced bands. The values of 10Dq are observed to increase from 16366.61 to 16447.37 cm-1 whereas, B values are observed to decrease from 829.81 to 760.80 cm-1 with additional Cr3+ substitution. The increasing 10Dq and decreasing B values, evidence for bonds between Cr3+ ions with their environments became a further covalent (less ionic). Moreover, the values of β are observed to decrease for further Cr3+ substitution. This decrease of β produces less stability between Cr3+ and its ligand. Furthermore, Dq/B values declare that Cr3+ centers are in the low-field sites by a slight tendency towards the high-field sites with further Cr/Fe substitution process. Therefore, it was suggested that Cr3+ substituted Mn–Zn nanoferrites are excellent candidates for diverse optical applications such as a tunable laser.

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