title: Analysis of the nu(12) Band of Ethylene-(13)C(2) by High-Resolution FTIR Spectroscopy.
abstract: The Fourier transform infrared (FTIR) spectrum of the nu(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 (nu(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 nu(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 Delta(12) was found to be 0.24300+/-0.00002 uÅ(2). Copyright 2001 Academic Press.
authors.affiliation: Natural Sciences Academic Group, Nanyang Technological University, National Institute of Education, 1, Nanyang Walk, Singapore, Singapore, 637616
authors.forename: T. L.
authors.initials: TL
authors.lastname: Tan
authors.forename: K. L.
authors.initials: KL
authors.lastname: Goh
authors.forename: P. P.
authors.initials: PP
authors.lastname: Ong
authors.forename: H. H.
authors.initials: HH
authors.lastname: Teo