Improved rovibrational constants for the v6 + v10 band of ethylene (12C2H4) by high-resolution Fourier transform infrared spectroscopy

• Main Authors: Lebron, Gissela B., Tan, T. L.
• Format: text
• Published: Animo Repository 2013
• Subjects: Ethylene; Fourier transform infrared spectroscopy; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/5783
• Institution: De La Salle University

Fourier transform infrared absorption spectrum of the ν6+ν10 combination band of 12C2H4 in the 1985-2100cm-1 region was measured at an unapodized resolution of 0.0063cm-1. The A-type ν6+ν10 band is centered at 2047.75817+/-0.00006cm-1. The rovibrational analysis performed on the band using a standard Watson's A-reduced Hamiltonian model in Ir representation yielded the most accurate set of v6+v10=1 state constants to date. Upper-state parameters inclusive of three rotational, five quartic and two sextic terms were derived from a total of 527 infrared transitions assigned and included in the final fit. The rms deviation of the fit was 0.000625cm-1.