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High-Resolution Study of the Mid-Infrared Region of FNO(2)
Journal of Molecular Spectroscopy
|September 15, 2000
Summary
High-resolution infrared spectroscopy of nitryl fluoride (FNO2) revealed perturbations in its vibrational spectrum. Coriolis interactions were identified, leading to refined spectroscopic constants and energies for dark states.
Area of Science:
- Molecular Spectroscopy
- Quantum Chemistry
- Physical Chemistry
Background:
- Nitryl fluoride (FNO2) is a molecule with a complex gas-phase infrared spectrum.
- Understanding its spectral properties is crucial for atmospheric and chemical studies.
Purpose of the Study:
- To analyze the gas-phase IR spectrum of nitryl fluoride (FNO2) between 1200 and 1900 cm(-1).
- To determine improved ground state rotational and centrifugal distortion constants.
- To investigate Coriolis interactions and their effects on spectral bands.
Main Methods:
- High-resolution (ca. 0.003 cm(-1)) infrared spectroscopy.
- Simultaneous analysis of existing and new spectral data.
- Application of Watson Hamiltonian for unperturbed bands.
- Use of triad and tetrad models to analyze Coriolis-perturbed bands.
Main Results:
- Improved ground state rotational and centrifugal distortion constants for FNO2 were obtained.
- Spectroscopic constants for the unperturbed nu(4) and 2nu(6) bands were determined.
- Strong Coriolis interactions were identified between nu(1), nu(2) + nu(3), and dark states (nu(5) + nu(6), nu(3) + nu(6), nu(2) + nu(5)).
- Coriolis interaction parameters and vibrational energies for dark states were determined.
Conclusions:
- The study provides a comprehensive analysis of perturbed and unperturbed vibrational bands in the FNO2 IR spectrum.
- Refined spectroscopic constants and interaction parameters enhance the understanding of FNO2 molecular dynamics.
- The findings contribute to accurate spectral assignments and modeling of nitryl fluoride.
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