Temperature-Dependent Yield of Frenkel Pairs Generated by Valence Excitation in NaCl
EMSL Project ID
7991
Abstract
The dynamics of formation of self-trapped excitons (STEs) and Frenkel pairs upon band-gap excitation have been studied in NaCl by femtosecond time-resolved spectroscopy at temperatures ranging from 6 to 330 K. We found that the primary yield of Frenkel pairs was governed by the process of exciton relaxation that terminated within 10 ps of excitation for all temperatures studied. The yield increases with temperature, and is anti-correlated with the yield of triplet STEs, showing a strong effect of temperature on branching during exciton relaxation. We discuss the mechanism of the temperature-dependent branching of excitons based on the present results and knowledge accumulated from studies of other crystals.Project Details
Project type
Exploratory Research
Start Date
2004-11-17
End Date
2006-11-20
Status
Closed
Released Data Link
Team
Principal Investigator
Related Publications
Kuta J, MCF Wander, Z Wang, S Jiang, N Wall, and AE Clark. 2011. "Trends in Ln(III) Sorption to Quartz Assessed by Molecular Dynamics Simulations and Laser Induced Flourescence Studies." Journal of Physical Chemistry C 115(43):21120-21127. doi:10.1021/jp204633g
Tanimura K, E Inami, J Kanasaki, and WP Hess. 2006. "Two-Hole Localization Mechanism for Electron Bond Rupture of Surface Atoms by Laser-Induced Valence Excitation of Semiconductors." Physical Review. B, Condensed Matter and Materials Physics 74(3):035337-1 - 035337-8.