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Analysis of the ν12 Band of Ethylene-13C2 by High-Resolution FTIR Spectroscopy

✍ Scribed by T.L Tan; K.L Goh; P.P Ong; H.H Teo

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
127 KB
Volume
207
Category
Article
ISSN
0022-2852

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✦ Synopsis

The Fourier transform infrared (FTIR) spectrum of the ν 12 fundamental band of ethylene-13 C 2 ( 13 C 2 H 4 ) was recorded with an unapodized resolution of 0.004 cm -1 in the frequency range from 1380 to 1500 cm -1 . Rovibrational constants for the upper state (v 12 = 1) up to five quartic and three sextic centrifugal distortion terms were derived for the first time by assigning and fitting a total of 1177 infrared transitions using a Watson's A-reduced Hamiltonian in the I r representation. The rms deviation of the fit was 0.00045 cm -1 . The ground state rovibrational constants were also determined for the first time by a fit of 738 combination differences from the present infrared measurements, with a rms deviation of 0.00060 cm -1 . The A-type ν 12 band with a band center at 1436.65411 ± 0.00005 cm -1 was found to be relatively free from local frequency perturbations. The inertial defect 12 was found to be 0.24300 ± 0.00002 u Å2 .

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