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The H2S Spectrum around 0.7 µm

Flaud¹, Vaittinen, Campargue

¹Laboratoire de Photophysique Moléculaire, CNRS, Bâtiment 213 - Université Paris-Sud, Orsay, 91405, France

Journal of Molecular Spectroscopy

|December 16, 1998

Summary

High-resolution overtone spectra of hydrogen sulfide (H2S) were analyzed. Researchers identified interacting rovibrational states and detailed resonance interactions, revealing local mode behavior in H2S spectra.

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Area of Science:

Molecular Spectroscopy
Quantum Chemistry
Spectroscopy

Background:

The overtone spectrum of hydrogen sulfide (H2S) provides crucial insights into molecular vibrations and energy levels.
Understanding these spectra is essential for accurate molecular modeling and predicting chemical behavior.

Purpose of the Study:

To record and analyze the overtone spectrum of H2S in the 14100-14400 cm-1 region.
To assign rovibrational lines and investigate interactions between different energy states.
To characterize the local mode behavior and resonance interactions within the H2S molecule.

Main Methods:

Intracavity laser spectroscopy was employed to record the H2S overtone spectrum.
Rovibrational analysis was performed to assign spectral lines to specific energy states.
A Hamiltonian matrix was used to model the interactions between rovibrational levels.

Main Results:

80 rotational upper-state levels were observed and reproduced using the Hamiltonian.
Interactions between {(402), (303)} and {(322), (223)} states were identified, including anharmonic and Coriolis resonances.
Band centers for {(60(+), 0)} and {(50(+/-), 2)} states were determined as 14291.122 cm-1 and 14284.705 cm-1, respectively.
Evidence for local mode behavior was observed through Hamiltonian constants.

Conclusions:

The study successfully assigned numerous rovibrational levels in the H2S overtone spectrum.
Resonance interactions significantly influence the spectral intensities and energy level structure.
The findings confirm and refine the understanding of local mode behavior in H2S.

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