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The Hyperfine Structures of ScCl and ScF.
1Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada
Journal of Molecular Spectroscopy
|January 19, 2000
Summary
Fourier transform microwave spectroscopy revealed details of scandium fluoride (ScF) and scandium chloride (ScCl) molecules. ScCl exhibits highly ionic bonding, with refined structural parameters and estimated energetic properties.
Area of Science:
- Physical Chemistry
- Spectroscopy
- Molecular Physics
Background:
- Gaseous scandium compounds ScF and ScCl are of interest for understanding chemical bonding.
- Previous studies may lack detailed spectroscopic data on their electronic and vibrational states.
Purpose of the Study:
- To measure and analyze the Fourier transform microwave spectra of gaseous ScF and ScCl.
- To determine molecular constants, including hyperfine interactions and electronic structure.
- To investigate the ionic nature of ScCl and estimate its thermochemical properties.
Main Methods:
- Fourier transform microwave spectroscopy was employed to record spectra.
- Analysis of rotational transitions (J=1-0, J=2-1) in ground and excited vibrational states.
- Determination of nuclear quadrupole coupling, spin-rotation, and spin-spin constants.
Main Results:
- Spectra of ScF, Sc(35)Cl, and Sc(37)Cl were successfully measured.
- Accurate determination of various spectroscopic constants for ScF and ScCl.
- ScCl was confirmed to be highly ionic, with reevaluated equilibrium bond length and estimated vibrational frequency and dissociation energy for Sc(35)Cl.
Conclusions:
- The study provides comprehensive spectroscopic data for ScF and ScCl.
- The electronic structure and bonding in these molecules have been elucidated.
- A simple model for Sc quadrupole coupling constants was found to be inadequate.