Rovibrational constants for the ground state and v8 = 1 state of ethylene-d3 (C2HD3) by high-resolution FTIR spectroscopy

College

College of Science

Department/Unit

Physics

Document Type

Article

Source Title

Journal of Molecular Spectroscopy

Volume

269

First Page

109

Last Page

112

Publication Date

2011

Abstract

The Fourier transform infrared (FTIR) spectrum of the ν8 fundamental band of ethylene-d3 (C2HD3) was recorded with a unapodized resolution of 0.0063 cm−1 in the wavenumber region of 840–980 cm−1. By assigning and fitting a total of 738 infrared transitions using a Watson’s A-reduced Hamiltonian in the Ir representation, rovibrational constants for the upper state (ν8 = 1) up to all five quartic centrifugal distortion terms were derived for the first time. The root-mean-square (rms) deviation of the fit was 0.00076 cm−1. The ground state rovibrational constants of C2HD3 were also determined for the first time by a fit of 450 combination-differences from the present infrared measurements, with rms deviation of 0.00075 cm−1. Local frequency perturbations were not detected in the C-type ν8 band of C2HD3 which is centered at 918.73199 ± 0.00007 cm−1.

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Disciplines

Physics

Keywords

Ethylene; Fourier transform infrared spectroscopy

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