FAR-INFRARED SYNCHROTRON-BASED SPECTROSCOPY OF PROTON TUNNELLING IN MALONALDEHYDE

Goudreau, E.S.

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https://hdl.handle.net/2142/79158 Copy

Description

Title

FAR-INFRARED SYNCHROTRON-BASED SPECTROSCOPY OF PROTON TUNNELLING IN MALONALDEHYDE

Author(s)

Goudreau, E.S.

Contributor(s)

• Ross, Stephen Cary
• Tokaryk, D.W.

Issue Date

23-Jun-15

Keyword(s)

Mini-symposium: Accelerator-Based Spectroscopy

Abstract

Malonaldehyde (C$_{3}$O$_{2}$H$_{4}$) is a prototype molecule for the study of intramolecular tunnelling proton transfer. In the case of malonaldehyde, this transfer occurs between the two terminal oxygen atoms in its open-ring structure. Although the ground state tunnelling splitting of 21 wn has been accurately determined from microwave studiesfootnote{T. Baba, T. Tanaka, I. Morinoa, K. M. T. Yamada, K. Tanaka. emph{Detection of the tunneling-rotation transitions of malonaldehyde in the submillimeter-wave region}. J. Chem. Phys., textbf{110}. 4131-4133 (1999)}, the splitting has never been obtained with high resolution in any excited vibrational state. The nub{6} vibrational band was investigated in a diode laser jet experimentfootnote{C. Duan, D. Luckhaus. emph{High resolution IR-diode laser jet spectroscopy of malonaldehyde}. Chem. Phys. Lett., textbf{391}, 129-133 (2004)} in 2004, but the researchers were not able to identify the (-) parity tunnelling component and so could not determine the splitting. We have collected high-resolution far-IR Fourier transform spectra from a number of fundamental vibrational bands of malonaldehyde at the CLS (Canadian Light Source) synchrotron in Saskatoon, Saskatchewan, exploiting the considerable gain in signal-to-noise ratio at the highest resolution available afforded by the intense and well-collimated beam. We will report on our tunnelling-rotation analysis of the anti-symmetric out-of-plane bend near 384 wn and present its tunnelling splitting value. begin{wrapfigure}{r}{0pt} includegraphics[scale=0.13]{MA_2.eps} end{wrapfigure}

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79158

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