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Ab initio intermolecular potential-energy surface and microwave spectra for the Ne-OCS complex
Hua Zhu1, Yanzi Zhou, Daiqian Xie
1Department of Chemistry, Sichuan University, Chengdu 610064, China.
The Journal of Chemical Physics
|July 13, 2005
Summary
This study calculates the Ne-OCS potential energy surface using coupled-cluster methods. Rovibrational energy levels and microwave spectra were determined for five isotopomers, agreeing well with experimental data.
Area of Science:
- Physical Chemistry
- Computational Chemistry
- Molecular Spectroscopy
Background:
- Understanding intermolecular forces is crucial for predicting molecular behavior.
- Accurate potential energy surfaces are essential for theoretical simulations of molecular interactions.
Purpose of the Study:
- To compute an ab initio potential-energy surface for the Ne-OCS complex.
- To calculate rovibrational energy levels and transition frequencies for Ne-OCS isotopomers.
Main Methods:
- Coupled-cluster singles and doubles with noniterative inclusion of connected triples [CCSD(T)] calculations.
- Supermolecular approach with counterpoise correction for basis set superposition error.
- Two-dimensional discrete variable representation method for rovibrational calculations.
Main Results:
- A potential energy surface with three minima (T-shaped, linear Ne-SCO, linear Ne-OCS) was determined.
- Rovibrational energy levels were calculated for five Ne-OCS isotopomers.
- Calculated rotational transition frequencies matched experimental microwave spectra well.
Conclusions:
- The calculated potential energy surface accurately describes the Ne-OCS interaction.
- The theoretical model successfully predicts the observed microwave spectra, including transition intensities.