Molecular Spectroscopy and Structure

Rotational spectroscopy measures how molecules spin in the gas phase, and because rotational energy levels are exquisitely sensitive to atomic positions and masses, the technique can determine molecular structures with sub-angstrom precision without the need for crystalline samples. Modern implementations—particularly chirped-pulse excitation and Fourier transform microwave methods—can capture the rotational fingerprints of dozens of species simultaneously, making it practical to map how molecules adopt different conformations, form hydrogen bonds with neighbors, and interconvert between shapes at room temperature. Researchers are actively working to characterize the conformational landscapes of larger and more flexible molecules, where the number of possible geometries grows rapidly and subtle energy differences between them govern biological and chemical reactivity. An open challenge is extending these gas-phase measurements to species that are difficult to vaporize intact, and connecting the precise structural snapshots obtained in isolation to the behavior of the same molecules in solution or in living systems.

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57,982

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Keywords

Rotational SpectroscopyMolecular StructureBroadband Microwave SpectroscopyGas PhaseHydrogen BondsConformational Dynamics