Theoretical Investigations of Silicon Oxide Cluster Dynamics

Theoretical studies of silicon oxide clusters probe the fundamental processes governing formation, transformation and reactivity of discrete (SiO_x)_n units in diverse environments. Atomistic simulations and quantum-chemical calculations have unraveled the geometric motifs and potential-energy surfaces that dictate cluster stability, revealing a progression from planar and rhombic cores to three-dimensional networks as size increases. Computational kinetics analyses quantify rate coefficients for gas-phase oxidation of SiO and its smallest aggregates, identifying key reaction pathways with OH and H₂O that underpin nucleation of larger silica and silicate particles. Spectroscopic modelling—especially density functional theory combined with Franck–Condon simulations—has enabled assignment of vibronic bands in electronic photodissociation spectra, illuminating excited-state dynamics and fragmentation channels of cationic clusters. These investigations highlight the sensitivity of cluster properties to charge state, hydration and coordination environment, with implications for dust formation around stars, heterogeneous catalysis and nanomaterials design. Theoretical insights continue to bridge scales from molecular precursors to mesoscale particles, guiding experimental efforts in infrared and optical spectroscopy, mass spectrometry and cluster beam techniques. Collectively, this body of work underscores the global significance of silicon oxide cluster dynamics in astrophysics, atmospheric chemistry and advanced materials science.

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Theoretical Investigations of Silicon Oxide Cluster Dynamics publication trend

The graph below shows the total number of articles in theoretical investigations of silicon oxide cluster dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Cluster dynamics: Study of structural changes, reactions and energy flow within finite aggregates of atoms or molecules.

Density functional theory (DFT): Quantum-mechanical method for calculating electronic structure and properties of molecules and materials.

Infrared multiple photon dissociation (IR-MPD) spectroscopy: Technique in which absorption of multiple infrared photons induces fragmentation of ionised clusters, yielding vibrational spectra.

Electronic photodissociation (EPD): Process whereby absorption of ultraviolet or visible photons by a molecular ion leads to bond cleavage and fragment detection.

Potential energy surface (PES): Multidimensional surface representing energy variations as atomic coordinates change, defining reaction pathways and transition states.

Silanol group: Si–OH functional unit formed on silicon oxide clusters or surfaces, identifiable by characteristic vibrational frequencies.

References

1. Mechanisms of SiO oxidation: Implications for dust formation. Frontiers in Astronomy and Space Sciences (2023).
2. Mechanisms and Thermochemistry of Reactions of SiO and Si2O2 with OH and H2O. The Journal of Physical Chemistry A (2023).
3. Gas-Phase Production of Hydroxylated Silicon Oxide Cluster Cations: Structure, Infrared Spectroscopy, and Astronomical Relevance. ACS Earth and Space Chemistry (2024).
4. Optical Spectroscopy and Photochemistry of Silicon Oxide Cations: The Case of Triatomic Si2O+ and SiO2 +. ACS Earth and Space Chemistry (2024).
5. Density functional theory study of silica clusters (SiO2)n-(n≤7). Acta Physica Sinica (2010).