Crystal field analysis of the ground and excited state absorption of a Cr4+ ion in LiAlO2 and LiGaO2 crystals

Open Physics ◽  
2005 ◽  
Vol 3 (4) ◽  
Author(s):  
Mikhail Brik ◽  
Nicolae Avram ◽  
Calin Avram
Keyword(s):  
Excited State ◽  
Crystal Field ◽  
Excited State Absorption ◽  
Field Analysis ◽  
Lithium Aluminum ◽  
Crystal Field Theory ◽  
Charge Model ◽  
Exchange Charge Model ◽  
Overlap Model ◽  
Good Agreement

AbstractThe exchange charge model of crystal field theory has been used to analyze the ground and excited state absorption of tetrahedrally coordinated Cr4+ ion in lithium aluminum oxide LiAlO2 (γ-phase) and lithium dioxogallate LiGaO2. The parameters of the crystal field acting on the Cr4+ ion are calculated from the crystal structure data, taking into account the crystal lattice ions located at distances up to 12.744 Å in LiGaO2 and 13. 180 Å in LiAlO2. The obtained energy level schemes were compared with experimental ground and excited state absorption spectra and literature data on the application of other crystal field models (the angular overlap model and Racah theory) to the considered crystals; a good agreement with experimental data is demonstrated.

ON THE CRYSTAL FIELD ANALYSIS OFCr4+ENERGY LEVELS INRb2CrF6

2006 ◽  
Vol 20 (17) ◽  
pp. 1007-1014 ◽  
Author(s):  
M. G. BRIK
Keyword(s):  
Crystal Field ◽  
Energy Levels ◽  
Experimental Spectrum ◽  
Field Analysis ◽  
Crystal Field Theory ◽  
Crystal Field Strength ◽  
Charge Model ◽  
Exchange Charge Model ◽  
Racah Parameters ◽  
Crystal Field Parameters

Optical absorption spectrum of Cr4+ion in Rb2CrF6is analyzed using the exchange charge model of crystal field theory. The crystal field parameters acting on the optical electrons of Cr4+are calculated using the crystal structure data; a good agreement between the calculated and observed energy levels of Cr4+in the title host is demonstrated. The crystal field strength Dq=2159 cm-1and Racah parameters B=639 cm-1, C=3605 cm-1were evaluated from the experimental spectrum.

scholarly journals Advances of crystal field theory and exchange charge model

2019 ◽  
Vol 21 (4) ◽  
Author(s):  
M.G. Brik ◽  
◽  
N.M. Avram ◽  
C.N. Avram ◽  
◽  
...  
Keyword(s):  
Field Theory ◽  
Crystal Field ◽  
Crystal Field Theory ◽  
Charge Model ◽  
Exchange Charge Model

Ground and excited state absorption of Ni2+ ions in MgAl2O4: Crystal field analysis

2007 ◽  
Vol 432 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
M.G. Brik ◽  
N.M. Avram ◽  
C.N. Avram ◽  
C. Rudowicz ◽  
Y.Y. Yeung ◽  
...  
Keyword(s):  
Excited State ◽  
Crystal Field ◽  
Excited State Absorption ◽  
Field Analysis

Excited State Absorption in Pr3+ Doped Fluorozirconate Glass

1991 ◽  
Vol 244 ◽  
Author(s):  
R. S. Quimby ◽  
B. Zheng
Keyword(s):  
Excited State ◽  
Excited State Absorption ◽  
Fiber Amplifier ◽  
Pump Probe ◽  
Probe Technique ◽  
Zblan Glass ◽  
Fluorozirconate Glass ◽  
A New Technique ◽  
Doped Glass ◽  
Good Agreement

ABSTRACTThe excited state absorption (ESA) spectrum for Pr3+ doped ZBLAN glass is determined using a new technique based on the McCumber theory [D.E. McCumber, Phys. Rev. 136, A954 (1964)]. ESA peaks at 1380 and 840 nm are found, corresponding to transitions from the 1G4 to the 1D2 and 1I6 levels, respectively. ESA at the fiber amplifier pump wavelength 1.017 μm is found to be very small. The new method is also applied to Er+ doped glass, and good agreement is obtained between the resulting ESA spectrum and previous measurements using a traditional pump-probe technique.

Prediction on Mn4+ -Doped Germanate Red Phosphor by Crystal Field Calculation on Basis of Exchange Charge Model: A Case Study on K2 Ge4 O9 :Mn4+

2016 ◽  
Vol 99 (7) ◽  
pp. 2388-2394 ◽  
Author(s):  
Pengfei Li ◽  
Mikhail G. Brik ◽  
Lejing Li ◽  
Jin Han ◽  
Xiaoman Li ◽  
...  
Keyword(s):  
Crystal Field ◽  
Field Calculation ◽  
Red Phosphor ◽  
Charge Model ◽  
Exchange Charge Model

Crystal Field Analysis and Electron-phonon Coupling in Sc2O3:Cr3+

2004 ◽  
Vol 59 (11) ◽  
pp. 799-803 ◽  
Author(s):  
M. G. Brik ◽  
N. M. Avram
Keyword(s):  
Crystal Field ◽  
Impurity Center ◽  
Energy Levels ◽  
Level Structure ◽  
Stokes Shift ◽  
Emission Spectra ◽  
Field Analysis ◽  
Crystal Field Theory ◽  
Energy Level Structure ◽  
Absorption And Emission

Crystal field analysis of the energy level structure of the Cr3+ ion in the Sc2O3 crystal is performed, using the exchange charge model of the crystal field theory. The crystal field parameters acting on the optical electrons of the Cr3+ ion at the sites with C2 and C3i symmetry are calculated from the crystal structure data. On the basis of the comparison between experimental absorption and emission spectra and theoretically calculated energy levels of Sc2O3:Cr3+, the conclusion is made that the spectroscopic properties of the title host are determined by the Cr3+ ion at the positions of C2 local symmetry. The Stokes shift S = 4.32 and the energy of the phonons effectively interacting with an impurity center h̅ω = 499 cm−1 are derived from the experimental spectra of absorption and emission

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