Mainz 2017 – scientific programme
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A: Fachverband Atomphysik
A 18: Helium Droplets and Systems (with MO)
A 18.6: Talk
Tuesday, March 7, 2017, 16:00–16:15, N 6
Infrared spectroscopy of HCl dissociation at 0.37K using free electron lasers. — •Devendra Mani1, Raffael Schwan1, Theo Fischer1, Arghya Dey1,2, Matin Kaufmann1, Britta Redlich2, Lex van der Meer2, Gerhard Schwaab1, and Martina Havenith1 — 1Lehrstuhl für Physikalische Chemie II, Ruhr Universität Bochum, Germany. — 2Institute for Molecules and Materials (IMM), Radboud University Nijmegen, Nijmegen, Netherlands
Dissociation of HCl in presence of few water molecules has recently been studied theoretically as well as spectroscopically. [1,2] These studies suggest that 4 water molecules are sufficient to dissociate one HCl molecule, forming a solvent separated H3O+(H2O)3Cl− dissociated cluster. Until now, attempts to observe this dissociated species had been focused on the O-H and H-Cl stretch regions. However, the results were obscured by the presence of vibrational bands of different (HCl)m−(H2O)n undissociated clusters in this spectral range. From the recent theoretical calculations [3], the umbrella type motion of the H3O+ moiety (prediction: broad band, 1300-1360 cm−1) appears to be a fingerprint signature for the dissociated cluster. We have studied this dissociation reaction in helium droplets, in the frequency range of 900-1700 cm−1, using free electron lasers at FELIX. A weak broad band, spanning from 1000 to 1450 cm−1, could be observed on specific mass channels. The results will be discussed in detail in the talk.
References: 1) H. Forbert et al., J. Am. Chem. Soc., 133, 4062 (2011). 2) A. Gutberlet et al., Science, 324, 1545 (2009).3) J. M. Bowman et al., Phys. Chem. Chem. Phys., 17, 6222 (2015).