The high resolution FTIR spectrum of the v2 band of formaldehyde isotopomer H213CO

• Main Authors: Tan, T. L., Lebron, Gissela B.
• Format: text
• Published: Animo Repository 2011
• Subjects: Formaldehyde; Formaldehyde—Isotopes; Physics
• Online Access: https://animorepository.dlsu.edu.ph/faculty_research/5779
• Institution: De La Salle University

The Fourier transform infrared (FTIR) absorption spectrum of the ν2 fundamental band of the formaldehyde isotopomer H213CO was recorded at an unapodized resolution of 0.0063 cm−1 in the 1630–1780 cm−1 region. Upper state (ν2 = 1) rovibrational constants inclusive of three rotational, five quartic, and six sextic centrifugal distortion constants were accurately determined by assigning and fitting 447 unperturbed infrared transitions with a rms deviation of 0.00056 cm−1 using Watson’s A-reduced Hamiltonian in the Ir representation. Analysis of new transitions measured in this work yielded more higher-order upper state constants with greater accuracy than previously reported. The band center of the A-type ν2 band was found to be 1707.980943 ± 0.000058 cm−1 while the calculated inertial defect Δ2 of the H213CO molecule was 0.09581 ± 0.00004 μÅ2.