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Infrared Action Spectroscopy of Low-Temperature Neutral Gas-Phase Molecules of Arbitrary Structure
Stockholm University, Faculty of Science, Department of Physics.
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Number of Authors: 6
2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, no 11, 118101Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2016. Vol. 117, no 11, 118101
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-135210DOI: 10.1103/PhysRevLett.117.118101ISI: 000383248700018PubMedID: 27661721OAI: diva2:1046902
Available from: 2016-11-15 Created: 2016-11-01 Last updated: 2016-11-15Bibliographically approved

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Salén, Peter
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