On the importance of far-infrared spectroscopy for non-polar spherical-top molecules

Boudon, Vincent

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https://hdl.handle.net/2142/100516 Copy

Description

Title

On the importance of far-infrared spectroscopy for non-polar spherical-top molecules

Author(s)

Boudon, Vincent

Contributor(s)

• Faye, Mbaye
• Manceron, Laurent
• Pirali, Olivier

Issue Date

2018-06-20

Keyword(s)

Mini-symposium: Far-Infrared Spectroscopy

Abstract

Highly-symmetric molecules like spherical-top possess no permanent dipole moment. Thus, at least in first approximation, their pure rotation spectrum is forbidden (or even strictly forbidden in the case of centrosymmetric species). It may thus seem useless to consider their far-infrared or THz spectrum. Nevertheless, this spectral region can provide invaluable information for these molecules. Firstly, in the case of tetrahedral species of type XY4, pure rotation lines in the ground or in excited vibrational states can be induced through centrifugal distortion. Secondly, the strict selection rules for sphericaltop molecules make some fundamental levels inaccessible though direct absorption. Here again, far-infrared studies can help to reach them through the study of low-lying difference bands. Thirdly, some larger and/or heavier species possess weak bands at low wavenumbers. In this talk, we will summarize some recent studies performed on the AILES beamline of the SOLEIL Synchrotron facility that illustrate these different cases with CH4, CF4, OsO4, RuO4, C10H16, C6N4H10, C8H8 and SF6.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100516

DOI

10.15278/isms.2018.WC05

Copyright and License Information

Copyright 2018 Vincent Boudon

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