Dresden 2011 – scientific programme

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MO: Fachverband Molekülphysik

MO 35: Spectroscopy in He Droplets

MO 35.7: Talk

Friday, March 18, 2011, 12:00–12:15, MER 02

High Resolution IR Spectroscopy of Deuterated Water Dimers in Helium Nanodroplets — Gerhard Schwaab¹, Anna Gutberlet², and •Martina Havenith¹ — ¹Physical Chemistry II, Ruhr University Bochum, D-44780 Bochum — ²Purdue University, Department of Chemistry, 560 Oval Drive, West Lafayette, IN 47907

Water dimer is a highly flexible molecule showing three different tunneling pathways. As basic building block of larger water clusters it has attracted a lot of experimental and theoretical interest.

Here, we report on the IR-spectra of dimers of HDO as donor with H₂O and HDO as acceptor embedded in superfluid helium nanodroplets in the region of the O-D stretch vibration. Due to acceptor donor interchange, only the energetically lower d-bonded species survive the rapid cooling process to the droplet temperature of 0.37 K. For HDO⋯DOH the donor stretch as well as the acceptor stretch vibration could be observed. Possible assignments will be discussed. The observed molecular constants will be compared with gas phase and matrix data.