Synchrotron Radiation And The Far-infrared And Mid-infrared Spectra Of Ncncs

Winnewisser, Manfred

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https://hdl.handle.net/2142/51088 Copy

Description

Title

Synchrotron Radiation And The Far-infrared And Mid-infrared Spectra Of Ncncs

Author(s)

Winnewisser, Manfred

Contributor(s)

• Billinghurst, Brant E.
• Ross, Stephen Cary
• Tokaryk, Dennis
• De Lucia, Frank C.
• Winnewisser, Brenda P.

Issue Date

2014-06-19

Keyword(s)

Large amplitude motions, internal rotation

Abstract

The large-amplitude in-plane bending vibration of NCNCS at 85 \wn \, has a potential energy function which includes a barrier to linearity with a height of about 285 \wn. The topology of the surface of the space defined by this two-dimensional potential function exhibits non-trivial monodromy. Therefore an energy/momentum map for a quantum system with its motion determined by such a potential takes the form of a lattice which contains a defect associated with the top of the barrier. In NCNCS, the wavenumber values of the fundamental vibrational excitation and the barrier height mean that easily accessible energy levels allow us to observe 3 bending vibrational levels below and 3 above the barrier, yet still below all of the other vibrational levels, allowing the study of all the levels in the neighborhood of the defect. In three measuring campaigns at the Canadian Light Source in May of the years 2011, 2012, and 2013 we have now obtained 8 of the 9 fundamental vibrational band systems of NCNCS in high resolution, in particular that of the large-amplitude bend in the FIR. So far only a-type spectra have been assigned. Thus we have now determined the $\Delta$$v_{\rm b}$ = 1, and $\Delta$$K_{\rm a}$ = 0 vibrational intervals (using bent molecule notation) but do not yet have experimental values for either rotational $\Delta$$K_{\rm a}$ = $+/-$ 1 intervals nor ro-vibrational $\Delta$$v_{\rm b}$ = 1, $\Delta$$K_{\rm a}$ = $+/-$ 1 intervals. In May of 2014 we will have our last measuring campaign and hope to observe the more elusive b-type transitions.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51088

DOI

https://doi.org/10.15278/isms.2014.RJ13

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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