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High-Resolution Fourier Transform Infrared Spectrum of the ν12 Fundamental Band of Ethylene (C2H4)

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

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
92 KB
Volume
203
Category
Article
ISSN
0022-2852

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✦ Synopsis

The infrared spectrum of the 12 fundamental band of ethylene (C 2 H 4 ) has been measured with an unapodized resolution of 0.004 cm Ϫ1 in the frequency range of 1380 -1500 cm Ϫ1 using the Fourier transform technique. By assigning and fitting a total of 1387 infrared transitions using a Watson's A-reduced Hamiltonian in the I r representation, rovibrational constants for the upper state (v 12 ϭ 1) up to five quartic and three sextic centrifugal distortions terms were derived. They represent the most accurate constants for the band so far. The rms deviation of the fit was 0.00033 cm Ϫ1 . The A-type 12 band with a band center at 1442.44299 Ϯ 0.00003 cm Ϫ1 was found to be relatively free from local frequency perturbations. The inertial defect ⌬ 12 was found to be 0.24201 Ϯ 0.00002 u Å 2 .

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