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Related Experiment Videos

Spectroscopy of TaO.

Al-Khalili1, Hällsten, Launila

  • 1Department of Physics, Stockholm University, Stockholm, S-11385, Sweden

Journal of Molecular Spectroscopy
|November 30, 1999
PubMed
Summary
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Researchers analyzed tantalum oxide (TaO) emission bands using Fourier transform spectroscopy (FTS). They identified new electronic states and improved understanding of the ground state, including a novel application of Hund

Area of Science:

  • Molecular Spectroscopy
  • Computational Chemistry

Background:

  • Tantalum oxide (TaO) is a molecule with complex electronic structure.
  • Understanding TaO's electronic states is crucial for various chemical and physical applications.

Purpose of the Study:

  • To investigate the emission spectra of TaO.
  • To identify and characterize new electronic states of TaO.
  • To refine the understanding of the ground electronic state (X(2)Delta) of TaO.

Main Methods:

  • Fourier transform spectroscopy (FTS) was employed to record emission bands.
  • An electrodeless 2450-MHz discharge was used as the excitation source.
  • On-line monitoring with a MES spectrometer facilitated data acquisition.

Main Results:

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  • Emission bands of TaO were recorded between 7000 and 28 000 cm(-1).
  • Transitions involving 14 electronic substates, including one previously unreported state, were analyzed.
  • A Hund's case (a) description was applied to the X(2)Delta ground state for the first time.
  • Two additional states from an unreported band near 10 000 cm(-1) were analyzed, potentially involving a (2)Sigma state.
  • A local perturbation in the P' state was observed and modeled using a three-level interaction scheme.

Conclusions:

  • The study significantly expands the known electronic states of TaO.
  • Improved parameters for the X(2)Delta ground state were determined.
  • The findings provide new insights into molecular perturbations and their modeling.