INFRARED PHOTODISSOCIATION SPECTROSCOPY OF PROTONATED METHANOL CLUSTER IONS
Loading...
Date
2008
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Photodissociation spectra of the protonated methanol cluster ions, H$^+$(CH$_3$OH)$_n$ ($n=4-8$), were measured in the range of $900-2300$ cm$^{-1}$ by using a infrared free electron laser. A broad spectral feature was observed at about 1600 cm$^{-1}$ in each spectrum. We assign this feature to the OH$^+$ stretching vibration, which is coupled with the OH bending motion in the HOH$^+$ group. The small vibrational wavenumber suggests that the O-H$^+$ bond is very weak. Structure optimizations by the density functional theory show that H$^+$ is equally shared by two oxygen atoms at $n=4,5$. This result also demonstrates the weak bonding between H$^+$ and oxygen. The binding features of H$^+$ in the cluster ions will be discussed.
Description
Author Institution: Department of Chemistry, Faculty of Science, Tokyo University of Science, 1-3; Kagurazaka, Shinjuku, Tokyo, 162-8601, Japan