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

• Main Authors: Tan, T. L., Lebron, Gissela B.
• Format: text
• Published: Animo Repository 2011
• Subjects: Ethylene; Fourier transform infrared spectroscopy; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/5778
• Institution: De La Salle University

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.