The infra-red spectrum of C2D2 in the region of the bending fundamental v 5

Abstract

The absorption spectrum of C₂D₂ in the region of the bending fundamental v ₅ has been studied at a resolution better than 0·03 cm^-1. In addition to the fundamental, all the hot bands starting from the levels v ₄ and v ₅ have been investigated. Several molecular parameters have been derived. Special attention has been paid to illustrate the analysis of the effects of the l-type resonances on the vibrational levels 2v ₅ and (v ₄ + v ₅). The fundamental v ₅ of the isotopic molecule ¹²C ¹³CD₂ has also been observed.