Microwave Spectroscopy and Quantum Chemical Analysis
Summary
Microwave spectroscopy probes the rotational transitions of gas-phase molecules in the gigahertz region, yielding precise rotational constants that directly relate to the molecular moment of inertia and thus its three-dimensional geometry. Hyperfine interactions, such as nuclear quadrupole coupling and spin–rotation effects, further resolve subtle features of the electronic environment around nuclei. When complemented by quantum chemical analysis—ranging from density functional theory to high-level ab initio methods—experimental spectra can be interpreted in terms of equilibrium and vibrationally averaged structures, internal dynamics, and potential energy surfaces. This synergy enables rigorous benchmarking of computational approaches, facilitates identification of conformers and isotopologues, and quantifies barriers to internal motions. The combined methodology finds application in atmospheric and astrochemical monitoring, design of functional materials, and elucidation of reaction mechanisms, underscoring its broad global significance.
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Microwave Spectroscopy and Quantum Chemical Analysis publication trend
The graph below shows the total number of articles in microwave spectroscopy and quantum chemical analysis across all publications each year (not limited to Nature Index journals).
Technical terms
Rotational constant: Parameter derived from rotational spectral lines that reflects a molecule’s moment of inertia and bond lengths.
Centrifugal distortion constant: Correction factor accounting for bond stretching induced by rotational motion beyond the rigid rotor approximation.
Hyperfine splitting: Small separations in spectral lines caused by interactions between nuclear spins and molecular fields.
Nuclear quadrupole coupling: Interaction between a nucleus with spin >½ and the electric field gradient at its site, causing distinct splittings.
Torsional barrier: Energy barrier opposing free rotation about a single bond, observed as splitting of rotational lines.
Quantum chemical calculation: Computational approach using quantum mechanics to predict molecular geometries, energies and spectroscopic constants.
References
- The Microwave Rotational Electric Resonance (RER) Spectrum of Benzothiazole. Molecules (2023).
- Molecular structure and internal dynamics of the antioxidant 2,6-di-tert-butylphenol. Journal of Molecular Structure (2024).
- Revealing Internal Rotation and 14N Nuclear Quadrupole Coupling in the Atmospheric Pollutant 4-Methyl-2-nitrophenol: Interplay of Microwave Spectroscopy and Quantum Chemical Calculations. Molecules (2023).
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