High-Resolution Fourier Transform Infrared Spectrum of the nu(12) Fundamental Band of Ethylene (C(2)H(4)).
The infrared spectrum of the nu(12) fundamental band of ethylene (C(2)H(4)) has been measured with an unapodized resolution of 0.004 cm(-1) in the frequency range of 1380-1500 cm(-1) 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) = 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(-1). The A-type nu(12) band with a band center at 1442.44299 +/- 0.00003 cm(-1) was found to be relatively free from local frequency perturbations. The inertial defect Delta(12) was found to be 0.24201 +/- 0.00002 u Å(2). Copyright 2000 Academic Press.
Tan
TL
Division of Physics, School of Science, Nanyang Technological University, National Institute of Education, 469, Bukit Timah Road, 259756, Singapore
Lau
SY
Ong
PP
Goh
KL
Teo
HH