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LIFE'S COSMIC HANDSHAKE: DFT AND TD-DFT PREDICTIONS FOR THE PROPERTIES OF ENSTATITE (MgSiO₃) MONOMERS AND DIMERS
Stelmach, Kamil B.
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https://hdl.handle.net/2142/122540
Description
- Title
- LIFE'S COSMIC HANDSHAKE: DFT AND TD-DFT PREDICTIONS FOR THE PROPERTIES OF ENSTATITE (MgSiO₃) MONOMERS AND DIMERS
- Author(s)
- Stelmach, Kamil B.
- Contributor(s)
- Garrod, Robin T.
- Dukes, Catherine A.
- Issue Date
- 2023-06-20
- Keyword(s)
- Electronic structure
- potential energy surfaces
- Abstract
- Silicates represent an understudied class of molecules in astrochemistry despite surfaces having been shown to have important chemical and physical effects. Clinoenstatite has been detected in interstellar spaceᵃ and is a major component of meteorites.ᵇ Clinoenstatite is also interesting because it has chiral faces.ᶜ Structural and spectral studies utilizing density functional theory (DFT) and time-dependent (TD-) DFT were conducted on the monomer and a nanosilicate dimer of enstatite first described in Valencia et al.ᵈ; in addition, a 2D chiral conformer of the dimer was also studied. The HSE06/aug-cc-pVQZ level of theory was chosen for optimization, frequency, and energy calculations. CAM-B3LYP and ωB97X-D3 function- als were used with the cc-pVQZ basis set in the TD-DFT calculations to obtain the UV-Vis and ECD spectra. We modeled each structure in its bare silicate form but also with H, H⁺, and H₂. Placing the neutral H on the 2D chiral enstatite conformer produces a 3D structure that makes it optically active. This provides a symmetry breaking mechanism for chiral silicates in the ISM.
- Publisher
- International Symposium on Molecular Spectroscopy
- Type of Resource
- Text
- Genre of Resource
- Conference Paper / Presentation
- Language
- eng
- Handle URL
- https://hdl.handle.net/2142/122540
- DOI
- https://doi.org/10.15278/isms.2023.7017
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