Infrared Action Spectroscopy of Low-Temperature Neutral Gas-Phase Molecules of Arbitrary Structure

Vasyl Yatsyna, Daniël J. Bakker, Peter Salén, Raimund Feifel, Anouk M. Rijs, Vitali Zhaunerchyk

Research output: Contribution to JournalArticleAcademicpeer-review


We demonstrate a technique for IR action spectroscopy that enables measuring IR spectra in a background-free fashion for low-temperature neutral gas-phase molecules of arbitrary structure. The method is exemplified experimentally for N-methylacetamide molecules in the mid-IR spectral range of 1000-1800 cm-1, utilizing the free electron laser FELIX. The technique involves the resonant absorption of multiple mid-IR photons, which induces molecular dissociation. The dissociation products are probed with 10.49 eV vacuum ultraviolet photons and analyzed with a mass spectrometer. We also demonstrate the capability of this method to record, with unprecedented ease, mid-IR spectra for the molecular associates, such as clusters and oligomers, present in a molecular beam. In this way the mass-selected spectra of low-temperature gas-phase dimers and trimers of N-methylacetamide are measured in the full amide I-III range.

Original languageEnglish
Article number118101
JournalPhysical review letters
Issue number11
Publication statusPublished - 9 Sept 2016
Externally publishedYes


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