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Relativistic calculations on the transition electric dipole moments and radiative lifetimes of the spin-forbidden transitions in the antimony hydride molecule

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Chinese Physics B 2022年第8期31卷 125-130页

作者： Yong Liu Lu-Lu Li Li-Dan Xiao Bing Yan Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China

Calculations on the spectroscopic constants and transition properties of the first three states(a^(1)△,b^(1)Σ^(+),and X3Σ-)of the Sb H molecule were performed under the relativistic framework using the exact two-component Hamiltonian(X2C).The potential energy curves in the Franck-Condon region were computed and compared with the previous ***,the transition dipole moments for the weak spin-forbidden transitions(b0^(+)-X10^(+),b0^(+)-X_(2)1,X10^(+)-X_(2)1,and X_(2)1-a2)were *** spontaneous radiative lifetime of the b1Σ^(+)(υ′=0)state was calculated as 163.5±7.5μs,which is in reasonable agreement with the latest experimental value of 173±3μ*** spontaneous radiative lifetimes of the X_(2)1(υ′=0)state and the a2(υ′=0)state were calculated to be 48.6 s and~8 ms,*** study is expected to be a benchmark transition property computation for comparison with other theoretical and experimental *** datasets presented in this paper,including the transition dipole moments,are openly available at https://***/10.11922/sciencedb.j00113.00018.

关键词： Sb H transition properties radiative lifetimes

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Thermal and radiative characteristics of oxyfluoride glass singly doped with lanthanide ions

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Journal of Rare Earths 2010年第6期28卷 893-898页

作者： Barbara KLIMESZ Grazyna DOMINIAK-DZIK Witold RYBA-ROMANOWSKI Department of Physics Opole University of Technology Institute of Low Temperature and Structure Research Polish Academy of Sciences

Rare earths-doped oxyfluoride glasses based on germanium oxide and lead fluoride were prepared from commercial raw materials. The glasses with general composition of 50GeO2-(50-x-y)PbO-yPbF2-xLnF3 (Ln=Pr3+-Yb3+), contained different concentrations of optically active dopants (x=0.2 mol.% and 2 mol.%) and PbF2 (y≤15 mol.%). The differential thermal analysis (DTA) was used to determine both thermal characteristic and thermal stability properties of the glasses in the function of the kind of dopant, its concentration, and a glass composition. Characteristic glass temperatures such as glass transition temperature (Tg), glass crystallization temperature (Tc) and temperature corresponding to the maximum of the crystallization rate (Tpc) were evaluated. On the basis of obtained results, the thermal stabilities of glasses under study were evaluated using various thermal stability criteria (Dietzel factor ?T, Saad-Poulain factors H’ and S). It was found that the increase in rare earth fluoride contents influenced thermal characteristics when the characteristic temperatures of the individual glass was shifted towards higher values. The effect of the PbF2 content and the kind of rare earth impurity on the glass stability was observed. Absorption spectra of lanthanide-doped glasses were measured at room temperature and used to determine the phenomenological intensity parameters Ωt and next, to estimate radiative properties of lanthanide ions in this matrix. radiative transition probabilities of luminescent states of Ln3+, branching ratios and radiative lifetimes were determined. The variation of the Ωt along the lanthanide series was presented and discussed.

关键词： oxyfluoride glasses rare earths DTA thermal stability of glasses radiative transition probabilities radiative lifetimes

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Evolution of Luminescence with Shell＇s Thickness in Colloidal CdSe/CdS Core/Shell Quantum Dots

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Chinese Physics Letters 2008年第12期25卷 4431-4434页

作者：梁大顺沈里王志兵崔一平张家雨叶永红 Advanced Photonics Center Southeast University Nanjing 210096 Department of Physics Nanjing Normal University Nanjing 210097

We synthesize colloidal CdSe/CdS core/shell quantum dots with different shell thicknesses, and there are five samples including CdSe core dots, and CdSe/CdS core/shell dots with 1-4 CdS layers. X-ray diffraction and Raman measurements indicate that the stress in CdSe core becomes stronger with the increasing shell thickness, and the optical measurements show that when the shell becomes thicker, the photolumineseence quantum yield is enhanced, and the radiative decay is also expedited. The temperature-dependent optical spectra are measured. The relation between the microstrueture and the optical properties is discussed.

关键词： radiative lifetimes NANOCRYSTALS EMISSION EXCITONS MATRIX Nanocrystals Exciton emission radiative lifetimes Optical variables measurement luminescence Quantum dots quantum yield

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