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Updated: Jun 2, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
Jet-cooled rotational spectrum of laser-ablated phenylalanine
Cristóbal Pérez1, Santiago Mata, Susana Blanco
1Grupo de Espectroscopia Molecular (GEM), Edificio Quifima, Área de Química-Física, Parque Tecnológico, Campus Miguel Delibes, Universidad de Valladolid, 47005 Valladolid, Spain.
Abstract:
The rotational spectrum of neutral phenylalanine has been recorded for the first time using laser-ablation molecular-beam Fourier transform microwave spectroscopy (LA-MB-FTMW). Two conformers stabilized by conjugative O-H···N and N-H···π hydrogen bond interactions have been conclusively identified on the basis of experimental values of rotational and (14)N nuclear quadrupole coupling constants. The nonobservation of the rotational spectra of the other low-energy conformers has been attributed to the photofragmentation that takes place in the laser ablation process. Nuclear quadrupole coupling interactions have been used directly to determine the orientation of the amino group and to identify and experimentally characterize the N-H···π interactions.
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