Impurity optical absorption spectra of ZnGa"2Se"4:Ni^2^+ single crystals - Kim, W.-T.; Jin, M.-S.; Cheon, S.-H.; Kim, Y.-G.; Park, B.-S. (Elsevier)
The optical absorption of single crystals of ZnGa"2Se"4:Ni^2^+ grown by the chemical transport reaction method was investigated in the temperature region 20-300 K. In the single crystals the impurity optical absorption peaks due to the transitions ^3T"1(^3F) -〉 ^3T"2(^3F), ^3T"1(^3F) -〉 ^3A"2(^3F) and ^3T"1(^3F) -〉 ^3T"1(^3P) of the Ni^2^+ ions sited in the host lattice of the ZnGa"2Se"4 single crystal with Td symmetry appeared at 4444, 7874 and 11 600 cm^-^1, respectively. The crystal-field parameter and the Racah parameter were given by Dq = 340 cm^-^1 and B = 615 cm^-^1, respectively. The peak due to the transition ^3T"1(^3F) -〉 ^3T"1(^3P) split into four levels by first order spin-orbit-coupling effects of Ni^2^+ ions in the lower temperature below 150 K. The spin-orbit-coupling parameter was found to be λ = -400 cm^-^1.
http://linkinghub.elsevier.com/retrieve/pii/0038-1098(90)90619-M
Keywords: U