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

Journal article
Authors Vasyl Yatsyna
Daniel Bakker
Peter Salén
Raimund Feifel
Anouk Rijs
Vitali Zhaunerchyk
Published in Physical Review Letters
Volume 117
Issue 11
Pages artikel nr 118101
ISSN 0031-9007
Publication year 2016
Published at Department of Physics (GU)
Pages artikel nr 118101
Language en
Links dx.doi.org/10.1103/PhysRevLett.117....
https://gup.ub.gu.se/file/203057
Subject categories Physical Sciences

Abstract

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.

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