The infra-red absorption spectrum of DNCO

The infra-red spectrum of DNCO has been examined over the range 3000-400 cm⁻¹ under medium resolution. The six fundamentals have been observed and assigned as follows: ν₁, 2634·9 cm⁻¹; ν₂, 2235 cm⁻¹; ν₃, 1310 cm⁻¹; ν₄, 460 cm⁻¹; ν₅, 766·8 cm⁻¹ and ν₆, 602·9 cm⁻¹. The fundamentals ν₄ and ν₅ interact by Coriolis coupling with ν₆ it has been determined that their unperturbed frequencies would be 468·5 and 758·3 cm⁻¹ respectively. It was found that A″ = 17·3 ± 0.1 cm⁻¹ and B̃″ = 0·3405 ± 0·0007 cm⁻¹.