Crystal-field analysis, upconversion, and excited-state dynamics for(U4+,U3+):Ba2YCl7single crystals

2003 ◽  
Vol 67 (19) ◽  
Author(s):  
Mirosław Karbowiak ◽  
Agnieszka Mech ◽  
Janusz Drożdżyński ◽  
Norman M. Edelstein
Keyword(s):  
Excited State ◽  
Crystal Field ◽  
Field Analysis ◽  
Excited State Dynamics

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.

Er3+-Doped Anatase TiO2 Nanocrystals: Crystal-Field Levels, Excited-State Dynamics, Upconversion, and Defect Luminescence

Small ◽  
2011 ◽  
Vol 7 (21) ◽  
pp. 3046-3056 ◽  
Author(s):  
Wenqin Luo ◽  
Chengyu Fu ◽  
Renfu Li ◽  
Yongsheng Liu ◽  
Haomiao Zhu ◽  
...  
Keyword(s):  
Excited State ◽  
Crystal Field ◽  
Anatase Tio2 ◽  
Tio2 Nanocrystals ◽  
Excited State Dynamics ◽  
Defect Luminescence

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 Dynamics in the RNA Nucleotide Uridine 5’-Monophosphate Investigated by Femtosecond Broadband Transient Absorption Spectroscopy

2019 ◽  
Author(s):  
Matthew M. Brister ◽  
Carlos Crespo-Hernández
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Transient Absorption ◽  
Electronic Energy ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Vibrationally Excited ◽  
Excited State Dynamics ◽  
Π State

<p></p><p> Damage to RNA from ultraviolet radiation induce chemical modifications to the nucleobases. Unraveling the excited states involved in these reactions is essential, but investigations aimed at understanding the electronic-energy relaxation pathways of the RNA nucleotide uridine 5’-monophosphate (UMP) have not received enough attention. In this Letter, the excited-state dynamics of UMP is investigated in aqueous solution. Excitation at 267 nm results in a trifurcation event that leads to the simultaneous population of the vibrationally-excited ground state, a longlived <sup>1</sup>n<sub>O</sub>π* state, and a receiver triplet state within 200 fs. The receiver state internally convert to the long-lived <sup>3</sup>ππ* state in an ultrafast time scale. The results elucidate the electronic relaxation pathways and clarify earlier transient absorption experiments performed for uracil derivatives in solution. This mechanistic information is important because long-lived nπ* and ππ* excited states of both singlet and triplet multiplicities are thought to lead to the formation of harmful photoproducts.</p><p></p>

Modulation of Excited State Dynamics in Lead Halide Perovskite Films with Electrical Bias

2019 ◽  
Author(s):  
Gergely Samu ◽  
R.A. Scheidt ◽  
A. Balog ◽  
C. Janáky ◽  
P.V. Kamat
Keyword(s):  
Excited State ◽  
Excited State Dynamics ◽  
Halide Perovskite ◽  
Electrical Bias ◽  
Lead Halide
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