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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
Published on: August 25, 2016
Spectroscopy of Cs2, RbCs, and Rb2 in solid 4He.
P Moroshkin1, A Hofer, V Lebedev
1Département de Physique, Université de Fribourg, Chemin du Musée 3, 1700 Fribourg, Switzerland. peter.moroshkin@unifr.ch
We studied alkali-metal dimers in solid helium, finding matrix interactions quench excited states. This populates a metastable state, matching theoretical models of molecular spectra.
Area of Science:
- Atomic and Molecular Physics
- Condensed Matter Physics
- Quantum Chemistry
Background:
- Alkali-metal dimers like Cs2 and RbCs exhibit unique spectral properties.
- Solid helium matrices provide a unique environment for studying molecular interactions.
- Previous studies observed Rb2 in solid helium, prompting further investigation.
Purpose of the Study:
- To investigate the absorption and fluorescence spectra of Cs2 and RbCs dimers in solid helium.
- To understand the influence of the solid helium matrix on molecular excited states.
- To compare experimental findings with theoretical calculations.
Main Methods:
- Experimental measurements of absorption and fluorescence spectra.
- Theoretical calculations of molecular states and Franck-Condon factors.
- Comparative analysis of experimental and theoretical data.
Main Results:
- Laser excitation of alkali-metal dimers in solid helium leads to quenching of excited states.
- Quenching efficiently populates the metastable (1) 3Π(u) state.
- Calculated Franck-Condon factors show reasonable agreement with experimental spectra.
Conclusions:
- Solid helium matrices significantly influence the photophysics of alkali-metal dimers.
- The metastable (1) 3Π(u) state plays a crucial role in the emission pathways.
- Theoretical modeling using Franck-Condon factors is effective for understanding these systems.
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