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Laser spectroscopy of Si3C
John F Stanton1, John Dudek, Patrice Theulé
1Center for Theoretical Chemistry, Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712, USA.
The Journal of Chemical Physics
|April 20, 2005
Summary
Researchers studied silicon carbide clusters (Si3C) using advanced spectroscopy. They identified a strong electronic transition, revealing insights into the molecule's behavior and potential interstellar presence.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Astrochemistry
Background:
- Silicon carbide clusters are potential interstellar molecules.
- Understanding their electronic transitions is crucial for astrochemistry.
- Previous experimental data on Si3C electronic structure was limited.
Purpose of the Study:
- To record and analyze the C 1B1<--X 1A1 band system of Si3C.
- To determine the strongest electronic transition in the visible spectrum.
- To investigate the excited state lifetime of Si3C.
Main Methods:
- Resonant two-color two-photon ionization spectroscopy.
- Silane/acetylene discharge.
- Ab initio calculations.
Main Results:
- The C 1B1<--X 1A1 band system of Si3C was successfully recorded.
- The origin band was identified at 24,925 cm-1 (3.09 eV).
- Spectra showed progressions in Si-Si stretching modes and sequence/hot bands, supported by calculations.
Conclusions:
- The strongest electronic transition of Si3C in the visible region was identified.
- The excited state has a short lifetime (picoseconds), suggesting rapid predissociation or internal conversion.
- Further studies are needed to explore the reasons for the short excited state lifetime.