Spectroscopy Of Ncncs At The Canadian Light Source: The Far-infrared Spectrum Of The Ν7 Region From 60-140 Cm−1

Tokaryk, Dennis

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https://hdl.handle.net/2142/51136 Copy

Description

Title

Spectroscopy Of Ncncs At The Canadian Light Source: The Far-infrared Spectrum Of The Ν7 Region From 60-140 Cm−1

Author(s)

Tokaryk, Dennis

Contributor(s)

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

Issue Date

2014-06-19

Keyword(s)

Large amplitude motions, internal rotation

Abstract

We report on the analysis of our spectrum from 60-140 \wn\ of the $\nu_7$ bending fundamental and associated hot band sequence of NCNCS, obtained on the far-infrared beamline at the Canadian Light Source synchrotron. The data were collected in May 2013, building upon what we learned conducting experiments in May 2011 and 2012 on this molecule. Calculations indicated that the $\nu_7$ system was very weak (one of the four weakest fundamental bands, all of comparable strength), but its spectrum became evident when 30 mTorr of NCNCS was admitted into the 2-m-long sample cell, through which the synchrotron beam passed 40 times. The best spectrum so far has been obtained with 121 mTorr of gas. Loomis-Wood plots reveal many branches, some of which were unambiguously assignable to $\Delta \nu_7 = +1$ subbands for $\nu_7^{\prime\prime} = 0, 1, 2, 3$ and for $K_a = 0, 1,2$ with $\Delta K_a = 0$ (a-type subbands) by comparison of lower-state combination differences with those obtained from the published pure-rotational data. We will continue the analysis by assigning as many a-type subbands as possible and by searching for b-type subbands with $\Delta K_a = \pm 1$ so that the connections between $K_a$-stacks can be measured. Finally, we will simultaneously fit the infrared and rotational data with a generalized semi-rigid bender Hamiltonian.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/51136

DOI

https://doi.org/10.15278/isms.2014.RJ14

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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