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Far-infrared spectra of the tryptamine A conformer by IR-UV ion gain spectroscopy

Journal article
Authors Michael Schmitt
Frans Spiering
Vitali Zhaunerchyk
Rienk T. Jongma
Sander Jaeqx
Anouk M. Rijs
Wim J. van der Zande
Published in Physical Chemistry Chemical Physics - PCCP
Volume 18
Issue 47
Pages 32116-32124
ISSN 1463-9076
Publication year 2016
Published at Department of Physics (GU)
Pages 32116-32124
Language en
Links doi.org/10.1039/C6CP02358D
Subject categories Chemical Sciences

Abstract

We present far infrared spectra of the conformer A of tryptamine in the 200 to 500 cm−1 wavenumber range along with resonant photoionization spectra of the far-infrared excited conformer A of tryptamine. We show that single-far-infrared photon excited tryptamine has highly structured resonance enhanced multi-photon ionization spectra, revealing the mode composition of the S1-state. Upon multiple-far-infrared photon absorption, the resonance enhanced multi-photon ionization spectrum broadens allowing ion gain spectroscopy to be performed. In the ion gain spectrum we detect the fundamental far-infrared modes but also combination and overtone bands with high efficiency. The implications to dip spectroscopy using a free electron laser compared to more conventional light sources are discussed.

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