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Related Experiment Video

Updated: Jul 20, 2026

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

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Near-Infrared Laser Spectroscopy of TiS: The b(1)Pi-X(3)Delta Transition.

Cheung¹, Ran, Tam

¹Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong

Journal of Molecular Spectroscopy

|August 10, 2000

Summary

Researchers analyzed the laser-induced fluorescence spectrum of the titanium sulfide (TiS) molecule. They identified new electronic transitions and investigated perturbations between the b(1)Pi and C(3)Delta states, revealing insights into molecular interactions.

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Area of Science:

Molecular Spectroscopy
Quantum Chemistry

Background:

The electronic structure and transitions of diatomic molecules like TiS are crucial for understanding chemical bonding and reaction dynamics.
Laser-induced fluorescence (LIF) spectroscopy is a powerful technique for probing excited electronic states of molecules.

Purpose of the Study:

To record and analyze the laser-induced fluorescence spectrum of TiS in the 769-863 nm region.
To assign observed subbands to specific electronic transitions and determine molecular constants.
To investigate perturbations between electronic states and elucidate spin-orbit interactions.

Main Methods:

Laser vaporization/reaction with supersonic cooling to produce TiS molecules.
Laser-induced fluorescence spectroscopy to record emission spectra.
Spectral analysis to assign transitions and determine molecular constants.

Main Results:

Twenty-one weak subbands were assigned to b(1)Pi-X(3)Delta, B(3)Pi(0)-X(3)Delta(1), and C(3)Delta-X(3)Delta transitions.
Evidence of perturbation of the C(3)Delta(1) state by the b(1)Pi state was found.
Molecular constants for the b(1)Pi state were determined, including T(e), omega(e), omega(e)x(e), B(e), and alpha(e).

Conclusions:

The study provides detailed spectroscopic data for TiS, expanding the understanding of its electronic states.
Spin-orbit interaction and configuration interaction between the b(1)Pi and C(3)Delta states were discussed.
The findings contribute to the fundamental knowledge of molecular spectroscopy and electronic structure theory.