The 4550 Å band system of glyoxal. II. Vibration–rotational analyses for 12 bands of C2H2O2

Abstract

Rotational analyses have been performed for 12 bands of the 1Au–1Ag (π*–n) transition of glyoxal. Approximately 15 000 lines have been assigned, and rotational and vibrational constants obtained by computer methods. The vibrations investigated are ν2′ (CO stretching), ν4′ (C–C stretching), ν5′ and ν5″ (CCO bending), and the torsional levels with ν7 ′ = 1–4 and ν7″ = 1–3. A Coriolis interaction has been found involving the vibrations ν7 (au) and ν12 (bu). Some weak anharmonic interactions have also been identified.