Infrared spectra of the Ne-C2D4 and Ar-C2D4 complexes

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Journal titleJournal of Molecular Spectroscopy
Pages2125; # of pages: 5
SubjectDirect measurement; Fundamental bands; Hindered internal rotations; Infrared spectrum; Rotational constants; Supersonic jets; Tunneling splittings; Vibrational shift; Argon; Ethylene; Neon; Quantum cascade lasers; Spectroscopy; Supersonic aerodynamics; van der Waals
AbstractSpectra of Ne-C2D4 and Ar-C2D4 are studied in the ν11 fundamental band region of C 2D4 (≈2200 cm-¹) using a tuneable quantum cascade laser to probe a pulsed supersonic slit jet expansion. The spectra are those of perpendicular bands of near-prolate asymmetric rotors, but with a doubling of transitions due to tunneling. These tunneling splittings are due to hindered internal rotation of C2D4 around its C-C axis, and are more prominent for Ne-C2D4 than for Ar-C2D4. The analysis yields the first direct measurement of the A rotational constants for these complexes, and shows that the vibrational shifts are very small (<0.3 cm-¹). Attempts to observe the spectrum of He-C2D4 were not successful.
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AffiliationSecurity and Disruptive Technologies; National Research Council Canada
Peer reviewedYes
NPARC number21270492
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Record identifier2fff085a-340b-4afd-904f-241b19e322fa
Record created2014-02-13
Record modified2016-05-09
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