Connections between the accuracy of rotational constants and equilibrium molecular structures.

Cristina Puzzarini, John F Stanton

Physical chemistry chemical physics : PCCP 2023 Jan 18

filter terms:

Rotational spectroscopy is the technique of choice for investigating molecular structures in the gas phase. Indeed, rotational constants are strongly connected to the geometry of the molecular system under consideration. Therefore, they are powerful tools for assessing the accuracy that quantum chemical approaches can reach in structural determinations. In this review article, it is shown how it is possible to measure the accuracy of a computed equilibrium geometry based on the comparison of rotational constants. But, it is also addressed what accuracy is required by computations for providing molecular structures and thus rotational constants that are useful to experiment. Quantum chemical methodologies for obtaining the "0.1% accuracy" for rotational constants are reviewed for systems ranging in size from small molecules to small polycyclic aromatic hydrocarbons. This accuracy for systems containing two dozen or so atoms opens the way towards future applications such as the accurate characterization of non-covalent interactions, which play a key role in several biological and technological processes.

Citation

Cristina Puzzarini, John F Stanton. Connections between the accuracy of rotational constants and equilibrium molecular structures. Physical chemistry chemical physics : PCCP. 2023 Jan 18;25(3):1421-1429