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

Michael Schmitt, Frans Spiering, Vitali Zhaunerchyk, Rienk T. Jongma, Sander Jaeqx, Anouk M. Rijs, Wim J. Van Der Zande

Research output: Contribution to JournalArticleAcademicpeer-review


We present far infrared spectra of the conformer A of tryptamine in the 200 to 500 cm1 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.

Original languageEnglish
Pages (from-to)32116-32124
Number of pages9
JournalPhysical Chemistry Chemical Physics
Issue number47
Publication statusPublished - 1 Jan 2016
Externally publishedYes


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