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Competition between folded and extended structures of alanylalanine (Ala-Ala) in a molecular beam

Journal article
Authors Vasyl Yatsyna
Ranim Mallat
T. Gorn
M. Schmitt
Raimund Feifel
A.M. Rijs
Vitali Zhaunerchyk
Published in Physical Chemistry Chemical Physics - PCCP
Volume 21
Issue 26
Pages 14126-14132
ISSN 1463-9076
Publication year 2019
Published at Department of Physics (GU)
Pages 14126-14132
Language en
Subject categories Molecular physics, Atomic physics


We report the gas phase conformational preferences of laser desorbed Ala-Ala dipeptides probed by action spectroscopy using the IRMPD-VUV method. The molecules were internally cooled through collisional cooling in a supersonic jet environment. An IR spectrum was obtained experimentally in the spectral range of 700–1850 cm−1, and subsequently interpreted with the help of quantum chemical calculations. Although theory predicts that folded structures have lower electronic energies and, thus, are more stable at low temperatures compared to their extended (β-strand-like) counterparts, analysis of the experimental data concluded the extended conformer to be the most dominant. An explanation to this observation is discussed in this paper and rationalized in terms of collisional conformer relaxation processes occurring in the supersonic jet molecular beam.

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Utskriftsdatum: 2019-12-07