title: High-Resolution Fourier Transform Infrared Spectrum of the nu(12) Fundamental Band of Ethylene (C(2)H(4)).
abstract: 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.
authors.affiliation: Division of Physics, School of Science, Nanyang Technological University, National Institute of Education, 469, Bukit Timah Road, 259756, Singapore
authors.initials: TL
authors.lastname: Tan
authors.initials: SY
authors.lastname: Lau
authors.initials: PP
authors.lastname: Ong
authors.initials: KL
authors.lastname: Goh
authors.initials: HH
authors.lastname: Teo