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Investigating the M*He exciplexes, M={Li,Na,K,Rb,Cs,Fr}: density functional approach
1Department of Chemistry, University of Fribourg, Chemin du Musée 9, 1700 Fribourg, Switzerland. mohamed.zbiri@unifr.ch
The Journal of Chemical Physics
|January 7, 2005
Summary
This study calculates potential energy curves for alkali metal-helium (MHe) exciplexes using density functional theory. Results reveal insights into bonding states crucial for understanding observed emission spectra.
Area of Science:
- Quantum Chemistry
- Spectroscopy
- Materials Science
Background:
- Exciplexes, such as alkali metal-helium (MHe) systems, are crucial in understanding emission spectra.
- Investigating the bonding states of these exciplexes is key to their experimental observation.
Purpose of the Study:
- To compute potential energy curves for ground and excited states of MHe exciplexes.
- To analyze the bonding nature and existence of states responsible for emission spectra.
- To compare calculated parameters with existing literature.
Main Methods:
- Density Functional Theory (DFT) formalism.
- Relativistic calculations using zeroth order regular approximation (ZORA) with and without spin-orbit (SO) coupling.
- Analysis of potential curves' depth (De) and position (Re).
Main Results:
- Calculated potential curves for MHe exciplexes, including Li-He, Cs-He, and Fr-He without SO coupling, and Cs-He with SO coupling.
- Presented De and Re parameters for non-SO coupled systems, showing good agreement with other studies.
- Provided bond analysis to understand the nature of bonding states.
Conclusions:
- The study provides valuable data on MHe exciplex potential curves.
- Findings contribute to understanding the origin of experimentally observed emission spectra.
- The inclusion of spin-orbit coupling offers a more comprehensive analysis for specific systems like Cs-He.