Single-Color Isomer-Resolved Spectroscopy.

Structural isomers, such as conformers or tautomers, are of significant importance across chemistry and biology, as they can have different functionalities. In gas-phase experiments using molecular beams, formation of many different isomers cannot be prevented, and their presence significantly complicates the assignment of spectral lines. Current isomer-resolved spectroscopic techniques heavily rely on theoretical calculations or make use of elaborate double-resonance schemes. We show here that isomer-resolved spectroscopy can also be performed using a single tunable laser. In particular, we demonstrate single-color isomer-resolved spectroscopy by utilizing electrostatic deflection to spatially separate the isomers. We show that for 3-aminophenol we can spatially separate the syn and anti conformers and use these pure samples to perform high-resolution REMPI spectroscopy, making the assignment of transitions to a particular isomer trivial, without any additional a priori information. This approach allows one to add isomer specificity to any molecular-beam-based experiment.

Citation

Grite L Abma, Dries Kleuskens, Siwen Wang, Michiel Balster, Andre van Roij, Niek Janssen, Daniel A Horke. Single-Color Isomer-Resolved Spectroscopy. The journal of physical chemistry. A. 2022 Jun 16;126(23):3811-3815

Mesh Tags

PMID: 35648652

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