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Full-Dimensional Quantum Dynamics of SiO in Collision with H2
Benhui Yang1, P Zhang2, Chen Qu3
1Department of Physics and Astronomy and Center for Simulational Physics, University of Georgia , Athens, Georgia 30602, United States.
The Journal of Physical Chemistry. A
|January 25, 2018
Summary
We developed the first full-dimensional potential energy surface for silicon monoxide (SiO) scattering with hydrogen (H₂). This enables accurate calculations of molecular collisions crucial for astrophysics.
Area of Science:
- Chemical Physics
- Quantum Mechanics
- Computational Chemistry
Background:
- Accurate collisional rate coefficients are essential for interpreting astronomical observations.
- Previous studies often relied on simplified models or different collision partners.
Purpose of the Study:
- To compute the first full-dimensional potential energy surface (PES) for SiO-H₂ interactions.
- To perform quantum mechanical close-coupling calculations for SiO-H₂ scattering.
- To provide accurate state-to-state rotational and rovibrational rate coefficients.
Main Methods:
- Explicitly correlated coupled-cluster (CCSD(T)-F12b) method for PES computation.
- Invariant polynomial approach for fitting the PES.
- Quantum mechanical close-coupling calculations for scattering cross sections and rate coefficients.
Main Results:
- Calculated pure rotational quenching cross sections for SiO in collision with H₂.
- Determined state-to-state rotational rate coefficients at various temperatures.
- Obtained rovibrational state-to-state and total quenching cross sections and rate coefficients for excited SiO with para- and ortho-H₂.
Conclusions:
- The developed PES and calculated rate coefficients represent a significant advancement for SiO-H₂ collisional studies.
- These results are vital for accurate modeling of interstellar clouds and other astrophysical environments.
- Comparison with previous approximate methods highlights the importance of full-dimensional treatments.
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