The high-resolution FTIR spectrum of the v4 + v8 band of trans-d2-ethylene (trans-C2H2D2)

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Journal of Molecular Spectroscopy

Volume

271

First Page

44

Last Page

49

Publication Date

2012

Abstract

The FTIR absorption spectrum of the hybrid A–B type ν4 + ν8 combination band of trans-C2H2D2 centered at 1845.98737 cm−1 in the 1730–1940 cm−1 region was recorded at an unapodized resolution of 0.0063 cm−1. A total of 2725 a- and b-type transitions was assigned and fitted to upper state (ν4 + ν8 = 1) rovibrational constants up to sextic terms using Watson’s A-reduced Hamiltonian in Ir representation. The b-type feature of the band was analyzed for the first time. The root-mean-square deviation of the IR fit was 0.00059 cm−1. The most accurate set of ground state rovibrational constants up to sextic terms was also derived from the simultaneous fit of 3340 ground state combination differences from the present analysis and the ν4 band of trans-C2H2D2. The transition dipole moment ratio μaμb was found to be 1.95 ± 0.06

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Disciplines

Physics

Keywords

Ethylene; Fourier transform infrared spectroscopy

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